Welcome to our latest post Unknown fun facts about the Crust of the Earth.
As we said that we will share facts about crust of course not of a pie and also not of a pizza
Then whose? Our Earth’s. Yes, our Earth also has a crust and that is on which we are living. Of course that there many facts about Crust that you and me not know like-
Did you know that Crust is only 1 per cent of Earth’s volume? Or that Crust is mostly made from oxygen? Or, that at its deepest point its temperature is around 700 F and yet it is the coolest layer?
These fun facts will really be amazing. So in this post, we will read such fun facts about the crust of the Earth.
Ok but let’s get introduced to them and then we read some interesting facts about the earth’s crust.
What is Earth’s Crust?
The crust is the outer and uppermost layer of Earth. And on its top, we live. And it stretches under both the land and oceans also.
Where is this Earth’s crust?
We can say- below our feet or under the water. Or, we can say layer above the mantle and also the closest layer to us.
There are two types of Earth’s crust- One is that- on the top of which we are standing, Continental crust (under the land). And second which is under the ocean- Oceanic crust.
Fun facts about the Crust of the Earth-
Earth’s mantle and crust formed around 100 million years after the formation of the planet, around 4.6 billion years ago.
Around Billions of years ago, the planetary material that would become the Earth started as a hot, viscous ball of rock.
The heaviest material like- mostly iron and nickel, sank to the centre of the new planet and became its core. The molten material that surrounded the core was we can say the early mantle.
Composition of Crust (by weight)
Oxygen 46.6% Silicon 27.7%
Aluminium 8.1% Iron 5.0%
All others 12.6%
The crust of Earth is made up of eight different chemical elements.
Igneous rocks make up around 90% of Earth’s crust by volume. This is not very noticeable because they are mostly covered by sedimentary or metamorphic rocks.
Like Earth, these extraterrestrial crusts are mostly made of silicate minerals.
Despite the Moon’s smaller size than, his crust is thicker than the crust of Earth.
Oceanic crust is only around 3-5 miles thick, on the other continental crust is around 25 miles thick. 25 miles may sound like it is very thick, but the crust is the thinnest of Earth’s three layers, making up only 1% of Earth’s volume.
The continental crust is thicker than oceanic, it is 30 km (20 mi) to 50 km (30 mi) thick. But, it is mostly made of less dense and more felsic rocks, such as granite.
Under the ocean there is oceanic crust, and it is made mostly from a rock called basalt. It is also made up of elements like iron, oxygen, silicon, magnesium, and aluminum.
Continental crust is very thick and light-colored while oceanic crust is thin and very dark.
Below the crust there is mantle and the crust and the upper part of the mantle together make up the lithosphere. This lithosphere is broken into pieces that are called tectonic plates that can move.
Sometimes these plates move far from each and sometimes they bump into or sometimes one plate may slide under another plate.
There are about 10 to 20 crustal plates on the planet, and they all move with different speeds.
The Eurasian plate is the slowest, and it moves even less than an inch each year.The fastest plate is the Cocos plate, which moves nearly 8 inches per year.
You may think a few inches of movement in a whole year doesn’t sound like very much, but the movement of the plates is a big deal!
That’s because the movement of these plates create all kinds of natural disasters like tsunamis, earthquakes, and volcanoes. Plate movements sometimes even build mountains.
Weren’t you wondering how scientists measure the movement of the tectonic plates?
They use satellites, and in present there are 21 satellites in orbit to measure these movements.
Continental crust has been very less affected or destroyed than the oceanic crust. That’s why the oldest oceanic basalt crust today is only about 200 million years.
Most of the continental crust is much older than this.
Scientists even have drilled 7.5 miles into Earth’s crust. Wow! The crust is the only layer that is enough to be studied by drilling.
Only a single family of silicates, the feldspars, account for around half of the material in the crust (60% by weight), and also the quartz. The other common minerals are mica and hornblende.
Only 8% of Earth’s crust is non-silicate minerals, and this 8% includes carbonates, sulfides, chlorides and oxides.
Continental crust is much thicker than oceanic, that’s why the thickest parts of continental crust are at the world’s tallest mountain ranges.
Like icebergs and the tall peaks of the Himalayas and the Andes are only part of the region’s continental crust that extends unevenly, even below the Earth as well as soaring into the atmosphere.
Suggested- Fun facts about volcano for kids
More about the Crust
At first the crust was much thinner, and probably they have changed often as the tectonic plates shifted a lot more than they have now.
The crust would have been destroyed many times by asteroids or comets by hitting the Earth, which was much common in the Late Heavy Bombardment.
The continental crust is made up of different kinds of rocks but mostly of silica and alumina. The silica and alumina of the Earth’s Crust are also called “sial.”
Each continent is part of the sea and is like an island and most of the island is above the water and this is why most of the continent is piece land that we live and walk on.
Oceanic crust may be heavier and denser, but continental crust is thicker and one of the older parts of the Earth’s crust.
The depth of continental crust varies much than oceanic crust and can be anywhere between six and 47 miles thick
Continental crust is almost always more much older than oceanic crust.
Because continental crust is very rarely destroyed and recycled in the process of subduction, some sections of continental crust are around as old as the Earth itself.
In this article we learn fun facts about the Crust of the Earth like Crust is only 1 percent of Earth’s volume, Crust is mostly made from oxygen, that at its deepest point it’s temperature is around 700 F and yet it is the coolest layer.
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