Name: What Can We Learn By Drilling Into The Earth's Mantle?
Uploaded: 2021-04-16T12:34:13.000Z
Duration: 4 min 20 s
Description: VoiceTubeの動画で発音を聞きながら英語表現を覚えよう！学べる英語：

So, guys, I just learned that drilling into the earth can tell us about outer space.

We all know the Earth is made of three major layers - the core, mantle, and crust, which

The crust floats on the mantle, a super-thick layer of mostly slowly moving rock.

We've been trying to reach the mantle since the 1960s, but despite numerous expeditions,

By all accounts, attempting to reach the mantle is dangerous and expensive, so why are we

Because the mantle can tell us a lot about the history and formation of our planet in

The mantle makes up 84% of the Earth's volume and is incredibly hot with temperatures that

range from around 1000 degrees celsius close to the crust and about 4000 degrees celsius

The weight of everything above it creates pressure that builds up tremendously the closer

The crust varies from 5 to 60 km thick, with the thinnest layers found under the ocean.

The farthest we've gotten was in the 1980s in Russia's Kola peninsula, where they dug

for 20 years and managed a 12 kilometer-deep hole, which was probably not even halfway

This and many expeditions have failed because of technical difficulties like improper equipment

and just plain bad luck in choosing spots to drill.

But this doesn't mean scientists have given up.

More recently, a team of scientists from the International Ocean Discovery Program (IODP)

drilled into the ocean crust and were able to retrieve rocks that showed signs of life

. We're not talking about mole people or green big eyed kind of life, but microbial life.

The rocks contained methane and hydrogen, which as one of the researchers stated “microbes

Similar rocks, gases, and conditions are found in other planets.

So, according to the researchers, these rock specimens can aid our search and understanding

of how extraterrestrial life may exist in similar inhospitable conditions in the depths

But reaching the mantle doesn't just teach us about space, it also teaches us about earth.

The mantle's activity is largely responsible for the movement of tectonic plates, which

scientists theorize influences volcanic activity, earthquakes, mountain ranges, and movement

So understanding the mantle more can help us better understand the earth's current

topography and it's history - Including how our continents shifted throughout the

If we can drill down to the mantle, researchers could have this type of information straight

from the source, increasing the accuracy.

Right now we can only make inferences about the structure of the earth based on how fast

an earthquake's' seismic waves, travel through the planet and the routes they take, what

we can see on the crust, and the composition of rock samples.

It wasn't too long ago that by chance a volcano ejected a diamond from the mantle

that confirmed that there is an ocean's worth of water in the mantle's transition

Scientists learned this because it contained ringwoodite, with a certain amount of water

And look, these rocks are great, but they are inconsistent - we don't know when the

next mantle rock will be spewed out of which volcano or if it will be intact enough for

scientists to derive meaningful conclusions.

We got lucky with this diamond, but often these rocks are too damaged.

Most have been belched out from volcanoes, ejected by tectonic plate crashes, or carried

These treacherous and often erratic journeys leave scars on them, and leave scientists

It's hard to know what characteristics were a result of the journey vs reflective of the

So drilling down to the mantle could mean that we would finally be able to get pristine

samples of the mantle, and even an entryway for further exploration.

It could give us a clear look at the mantle's composition, how it's moving, and more accurate

readings of its velocity, pressure, and temperature.

In essence, what the earth and possibly the universe is made of.

But the drilling we most often hear of is tied to oil.

To learn where oil comes from, check out this video over on TestTube News.