Earth – Page 4 – Awesci – Science Everyday

Estimating the Radius of Earth at the Beach

By Anupum Pant

For centuries we’ve known that the surface of earth is curved. That means even after the sun sets on land, you could see a second sunset by somehow quickly transporting to a higher place.

Take for example the Burj Khalifa, the tallest object humans have ever constructed. It is so tall that you could watch the sunset at the base of it, at some point in time, and the sun would set about two to three minutes later for someone living on the top floor of the building. So, in theory you could see the sunset once at the base and somehow quickly go up to see a second sunset, on the same day.

But that’s not how much you need to move away from the ground to see the second sunset. You could simply lie down on a beach, watch the sun set once, and could quickly stand up once the last bit goes down, to see it go down again. In fact, if you carefully calculate the time difference between these 2 sunsets using a stopwatch, and take the length of your body into account, you could actually calculate (estimate) the radius of the earth.

All you need is a stopwatch and a trip to the beach to calculate the radius of the earth. This page explains how it’s done.

As seen on a Vsauce video at 4:52 [video]

The Most Strangest Lava on Earth

By Anupum Pant

Common basaltic magmas are red hot. Their temperatures can range anywhere from 1000 to 1200 degrees centigrade. Whereas much cooler ones like Andesitic magma and the coolest silicate magma, Rhyolitic magma, range from 800 to 1000 degrees and 650 to 800 degrees respectively. Sampling these viscous and sticky lavas can be a tough job.

But when it comes to the most strangest lava you could find on earth, things get really strange. Presently, Tanzania’s Ol Doinyo Lengai is the only volcano that erupts the strange natrocarbonatite lava – a type of igneous rock rich in carbonates such as calcite and dolomite.

This magma erupts at about 500 degrees celsius, which is almost half the temperature of those other common basalt lavas, and is cool enough to be sampled using a simple spoon. Still hot, but nothing like even the coolest silicate magmas. Unlike the other common lavas, this one is mostly black, turns white within 24 hours of eruption and is red at night. And has a viscosity lesser than that of water.

What makes it weird is its chemical composition, which unlike those common red lavas found everywhere else, is made up of calcium, sodium and carbon dioxide.

[Read more]

How Much do Clouds Weigh?

By Anupum Pant

Oh clouds! Yes, the ones that seem like feather light cotton candies floating high up in the sky. They actually can contain huge amounts of water and can weigh as much as a jumbo jet!

Cumulus clouds which are typically a kilometre in width can contain about 500 tonnes of water, or could weigh as much as 100 elephants or 2,500 donkeys. And yet, it stays floating up there. How!?

Clouds have water distributed in form of innumerable tiny droplets across a huge space. For example, their usual density is equivalent to a teaspoon of water spread out in a volume of a small closet. Or about half gram per centimetre cube. They are so less dense that they are lighter than air. So they float up in air like a ball full of air would float on water.

Once the density of water starts increasing in a cloud, and the millions of tiny water particles start combining, they start forming relatively heavier droplets that ultimately fall out of the cloud. This comes down in the form of rain.

If you like that you’d probably also like raining frogs.

Singing Sand Dunes

By Anupum Pant

I cannot say why you’d do it, but suppose you were on a hike to the top of a 120 feet sand dune in the centre of some desert, say near Al-Askharah, a coastal town in Oman. Unfortunately, it’s also the mid summer time, with 50 degree Celsius winds blowing at 50 miles an hour, and the dune you are climbing has a slope of 30 degrees. There’s nothing else (besides sand) to be seen or heard for miles around you.

The numbers are apparently perfect for a very eerie phenomenon to occur. And then the whole desert suddenly cries out a booming chorus of a very low hum (Like someone playing a very low note on the cello). What could have possibly caused that?

For ages such sounds in the midst of empty deserts have been bewildering people. Marco polo mentioned it. Charles Darwin also wrote about the “Bellower” in The Voyage of the Beagle. Moreover, until recently, even modern scientists weren’t sure what caused these sounds. It was only during the year 2009 that things started becoming clear when a group of researchers started experiments with sand on an incline in a laboratory environment.

The low droning hums, now as we know, come from within the sand dunes. The Sand particles are blown by the wind, causing an avalanche. As the sand falls across the 30 degree incline of the dune, they vibrate, synchronise and send the vibrations into the dune. The dunes pick up these tiny synchronised vibrations and amplify them, causing the low droning hum; coherent enough to resemble musical notes.

This only happens at few places around the world. In Morocco the dunes cry out an echoing hum of 105 hertz. Whereas in Oman the sands create a mixture of frequencies ranging from low 90 to slightly less low, 150 hertz. Something similar is also heard in the death valley. The video explains…

Sea Glass – Is It Trash or What?

By Anupum Pant

In the Glass Beach, a beach in MacKerricher State Park near Fort Bragg, California, like the name tells you, you’d normally find too many glass pieces on the beach. These glass pieces that people often find in beaches like these, aren’t exactly those sharp shards of glass that are sharp enough to harm you. Rather they are physically and chemically weathered pieces of glass – round and small.

This type of glass is called sea glass and has been a fancy of those hobbyists who like collecting these pieces to make beautiful adornments.

This kind of glass, often found on some beaches usually starts as shards of broken glass from dump or other such sources. In about a span of 1-2 years, the tumbling and weathering makes these pieces smooth and rounded. And then they are collectively known as “genuine sea glass”

At this particular beach in California, the beach glass that has formed over the years, first started coming in when residents who lived close to the beach started dumping garbage into the beach. Local clean up services tried to clean up the mess, but most of it had already gone in for natural weathering by that time.

Soon after the clean-up services came around, the beach became a great place for hobbyists to collect these naturally weathered beautiful glass pieces. All the trash that was first thought to be a mess, now became a tourist attraction – Naturally weathered genuine sea glass was a thing of natural beauty now. And then this smuggling of sea glass by tourists had to stop. First the mess had to stop, now the mess being taken away by tourists had to stop.

And once the glass has started to go away, now there is a move to replace all the glass – that was once considered garbage!

[Read more]

The Mysterious Phenomenon of Sailing Stones Explained

By Anupum Pant

On a scenic dry lake feature, Racetrack Playa, in the California’s Death Valley national park has had something very mysterious going on which has made geologists scratch their head for several years.

On the dry lake bed are small and big rocks which have been moving mysteriously on the hard cracked surface, leaving long trails behind them. No one had known how, until now.

Incredible Natural Phenomenon – Sea Foam

By Anupum Pant

Sea foam is a fairly common occurrence. But usually when sea waves crash and get agitated, the organic matter present in the water forms a foam that is not too much in quantity. It forms and then breaks down before a lot of it gets collected. Normally, only a few thin lines of foam can be seen on the surface of the sea here and there.

However, sometimes when the conditions are totally right, the volume of foam formed can reach incredible levels. This happens when decayed algal matter washes up on the shore and the sea water gets agitated due to breaking waves.

In the past such a blanket of foam 1-3 meters high, formed in the sea, has been washed up on a couple of coastlines, where it has reached the roads and also into people’s homes. In spite of being a fascinating natural phenomenon to experience, this foam is only a trouble for the people wishing to carry on with their daily grind.

Most times it is harmless. But other times when the decayed algal matter has algal toxins, it can produce a foam that can make your skin and eyes irritated. Even mass deaths of sea creatures and birds have been seen in the past.

Door to Hell

By Anupum Pant

For more than 40 years now, a 250 feet hole in the ground in Turkmenistan has remained glowing with a yellow-orange flame. They call it the door to hell.

It started in the year 1971 when soviet scientists set up a rig to extract natural gas at that place, and the rig collapsed. When that happened, the scientists feared the spread of huge amounts of methane gas, and set the place on fire. They estimated that the fire would go out in a couple of hours. But it lasted, and has lasted for more than 40 years. The fire in it is still burning strong.

The hole is in a very isolated place and it’s hard to find directions to reach it. It is still a tourist place and locals do know how to reach it.

The huge blasts of hot air, and the pungent gases that emanate from the pit make it hard to stand at the edge, but mesmerized by its view people still do it.

The Highest Unclimbed Mountain

By Anupum Pant

Gangkhar Puensum, meaning three mountain siblings, is the tallest mountain in Bhutan with an elevation of 7,570 meters. Since the 80s several attempts have been made to climb this mountain – a part of which lies in Bhutan and the other part in Tibet. None of the attempts have ever been successful.

However in the year 1999, a team of climbers from Japan, after a protracted attempt to get a permit, were able to reach the top of one of the three peaks – Liankang Kangri – from the Chinese side of the mountain. Later, protests from local people in Bhutan made them stop.

So technically, the highest peak has never been climbed by anyone till date. Gangkhar Puensum remains the highest unclimbed mountain. The reason mostly is because obtaining a permit to climb it is almost impossible. It is prohibited by the government of Bhutan.

The prohibition by the government has mostly to do with the lack of rescue services at that place, and due to the local belief which considers the peak sacred – a home to holy spirits.

Gangkhar Puensum is certainly one of the uncharted mysterious places in the world where no one has gone and probably never will.

Staircase to the Moon

By Anupum Pant

Broome is a coastal town in the Kimberley region of west Australia. Every year when all the conditions perfectly fall in place, a very interesting and brilliant natural spectacle occurs. They call it “Staircase to the moon“. It indeed looks like stairs reaching to the moon. Thousands of tourists and the local people gather to watch it happen.

For it to happen the weather, sunset, moonrise and the tide conditions all need to be perfectly right. Before I tell you what happens there, look at a picture of this natural phenomenon. (Or it won’t seem very interesting if I tell you about it first).

This happens only during the low tide at the coast when the moon is rising. During the low tide, the mudflats get exposed and the rising moon creates this mesmerising reflection on the sand.

The natural phenomenon can also been seen from other coastlines at Onslow, Dampier, Cossack, Point Samson Peninsula, Hearson Cove and Port Hedland.

The 52 Year Old Fire

By Anupum Pant

Centralia, a small town in Pennsylvania sits on massive deposits of an A-class quality of coal – Under the town, in every direction, the coal veins span across several miles (50-80 miles long). In the 50s it used to be a bustling little town of about 2000 people, and yet the population of this town has dwindled to 10 now.

Some it has to do with the fact that Centralia has a fire burning underneath. A massive fire that accidentally started more than 50 years ago, and it still continues to burn, even today.

In May 1962, five volunteers were hired to clean up the landfill for Memorial day celebrations. Unlike every other time, when landfills were located at some other places and were set to fire to clean up, this time they were on an abandoned strip-mine pit next to the Odd Fellows Cemetery. Like the fire used to die off all the time, the fire set on that day (May 27th, 1962) never got extinguished. And then entered the labyrinth of abandoned coal mines beneath Centralia. The fire still burns…

Today, Centralia is no more than a ghost town. Several places here have huge cracks in the ground spewing hot steam.

By many, the fire is believed to be the sole factor in converting this bustling 50s town into a ghost town. However there’s much more to it than just the fire. Radiolab gives a great insight on it…

Although there is a 1 hour-long documentary on Youtube about this, do not forget to have a look at this short documentary about the town. “The Unknown Cameraman”, an urban explorer presents..

Coldest Spot in The Universe

By Anupum Pant

Where do you think is the coldest spot in the universe. Like many would have guessed, somewhere in the deepest places in space, the temperature would be coldest than anything else. After all, space being so massive, the probability that happening is so high outside of Earth. Probably the Boomerang Nebula is the coldest. At least that is what Google says:

At a positively frigid one Kelvin (that equates to –458 degrees Fahrenheit or –272 degrees Celsius), the Boomerang Nebula in the constellation Centaurus is officially the coldest known place in the entire Universe. It’s even colder than the background temperature of space!

No!

Behold, the coldest temperature ever recorded anywhere in the universe is in a laboratory, here on Earth – at MIT! It is extremely close to what the coldest temperature can be theoretically.

They call it the Bose-Einstein condensate (BEC). and the temperature reached has held a record since the year 2003 and in numbers, it is 10 trillionths of a degree F above absolute zero.

And the process ironically involves heating up to 700 degrees celsius to obtain a lots of free sodium atoms. Then, ironically again, they are hit with a laser to make them move lesser. And finally a special kind of evaporative cooling is done to reach nano-kelvin levels. That is how, extremely cold temperatures are reached.

The Coldest Place on Earth

By Anupum Pant

A couple of days back I wrote about the hottest place on earth. That made me think of how cold the coldest place would be. I was sure it’d be somewhere in one of the poles, but I wasn’t sure where exactly it was.

This is what Google said:

Aerial photograph of Vostok Station, the coldest directly observed location on Earth. The lowest natural temperature ever directly recorded at ground level on Earth is −89.2 °C (−128.6 °F; 184.0 K), at the Soviet Vostok Station in Antarctica, on July 21, 1983.

After a little more digging, I found that his was the old record. Turns out, the coldest place on earth now, not counting the laboratories, is still in the high ridges of the East Antarctic plateau close to Vostok station. It’s called the Dome B. And the coldest times happen when all the conditions are perfect.

When the conditions are right, the temperatures during winters can reach minus 92 degrees Celsius!

The Radioactive Lake of Kazakhstan

By Anupum Pant

If you haven’t heard about the operation Plowshare, it was a US operation focused at developing techniques that would help them utilize the massive power of nuclear weapons for peaceful construction purposes. Now if that sounds dumb, remember, it was the year 1961 when they thought of trying it out. Look back at other things from that time and you’ll realize how dumb those times were. Maybe the next generation will say the same for the year 2014.

How would someone use nuclear weapons for construction, you ask? If you think about it, using it to make huge holes in the ground, blasting rocks for mining seems like a good idea at first. How quick it would be, right? No.

After 27 such experimental blasts, the researchers from US learnt that this wasn’t a very wise thing to do, even if it seemed like a good idea. However, they ended up inspiring the Soviets.

While US had learnt about the ill effects of it and had stopped the operation by the year 1977, Soviets made their own version called “Nuclear Explosions for the National Economy” and continued doing it till the year 1989. 156 such tests were done by them.

Among all of them, one was done at the edge of a test site in Kazakhstan. In the year 1965, a 140 kiloton device was placed at about 180 meters below the surface, and detonated. As a result, a 400 meter wide and 100 meter deep hole was created in the ground.

This hole was planed to be a reservoir for an overflowing river nearby and it eventually got filled with water. A lake was formed. It has since been known as lake Chagan.

Lake Chagan contains water that remains radioactive till date. Even today the lake has “100 times more than the permitted level of radionuclides in drinking water“. Only at a distance of about 100 to 150 meters from the lake the radioactivity levels are at a background level.

Here is the video of the test that created this radioactive lake. The audio is in some other language, so you might have to do with just the video…

via [AmusingPlanet]

The Hottest Place on Earth – Not Death Valley!

By Anupum Pant

For years I’ve known that the death valley was the hottest place on earth. Of course, not counting the lava, laboratory furnaces, hot springs and other such smart-ass answers, the death valley has always been, in textbooks and beyond, the hottest place on our planet.

On July 10th 1913, the temperature there was measured to be around 56.7 degrees centigrade. Nowhere else has the mercury risen to such high levels since then. Or so we thought…

Until, like always, a science channel from YouTube – MinuteEarth – decided to dive in a little deeper.

This is what the weather statistics do when they measure the temperature – The temperature outdoors are measured in shade at about 1.5 meters above the ground. Of course they had a standard procedure set to do that, and there must be a solid reason for that.

But, practically, who are we kidding. Anyone who has been on a beach, barefoot on a sunny day knows how hot the surface of sand can get in the sun, right?

The data from NASA’s satellites equipped with spectroradiometers has a different story to tell. A place somewhere in the Lut desert in Iran is the winner. The temperature averaged in a 1 square kilometre by the satellite shows that temperatures here have reached a whooping 70.7 degree Celsius. The place is somewhere inside the blue circle I made on Google maps.

You could literally cook eggs in the open there. Anyway, that isn’t totally new. Mr. Sargunaraj claims to have cooked an egg on the streets of Tirunelveli District in Tamil Nadu, India too. And I’ve also seen a video of a restaurant serving eggs cooked in the open (without fuel).