Earth has been forming since four thousand million years ago, and it was very hot. it's believed that the continents were one big continent form, surrounded by ocean. and since 200 million years ago the big continent has split into the ocean, one piece of rock smaller than the one piece split into two continents and then into 6 continents as we know it now. across the years it has been forming oceans, lakes, rivers and mountains and many other geographical forms.
The changes in Earth's inner core is few compared to the changes on the surface, the distance between the Earth core and it's surface is about 6400 km, and there are many different geological layers between the core and the surface, the surface layer known as the Crust and it's formed of the six continents and the undersea ground, the Crust thickness is about 5 - 32 km thick and it's most thicker under the mountains.
The Crust layer itself is formed of two featured layers, the Surface layer and it's formed from low-density rocks like the Granite, the second layer of the Crust layer is called the Lava layer and it's formed by a group of melted rocks and metals altogether.
The layer that lies under the Crust is called the mantle layer and its thickness is about 2600 km to the half distance to Earth's core and it's a combination of lava, then we get to the core which is a solid substance with the diameter of 3500 km surrounded by iron and nickel.
Earthquakes happen because of Crust layer rocks movements and those Earthquakes can be measured by the seismograph which can draw the time in comparison with The intensity of the earthquake, while the earthquakes these days are less dangerous than the ones in the past.
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| Ancient Earth |
The changes in Earth's inner core is few compared to the changes on the surface, the distance between the Earth core and it's surface is about 6400 km, and there are many different geological layers between the core and the surface, the surface layer known as the Crust and it's formed of the six continents and the undersea ground, the Crust thickness is about 5 - 32 km thick and it's most thicker under the mountains.
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| Earth's Layers |
The Crust layer itself is formed of two featured layers, the Surface layer and it's formed from low-density rocks like the Granite, the second layer of the Crust layer is called the Lava layer and it's formed by a group of melted rocks and metals altogether.
The layer that lies under the Crust is called the mantle layer and its thickness is about 2600 km to the half distance to Earth's core and it's a combination of lava, then we get to the core which is a solid substance with the diameter of 3500 km surrounded by iron and nickel.
Earthquakes happen because of Crust layer rocks movements and those Earthquakes can be measured by the seismograph which can draw the time in comparison with The intensity of the earthquake, while the earthquakes these days are less dangerous than the ones in the past.
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| Crustal Layer Components |
The Volcanoes happen when the Crustal level layer split to extract the lava into the surface of Earth and one of the biggest volcanoes in history is the one happened in late 1883 in Krakatoa island when the explosion has affected the oceans all over the world and made a big wave of sea tide.
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