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Layers of the earth

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Carmela Mendoza

The document summarizes the different layers that make up the Earth's structure. It describes the crust, mantle, and core in 3-4 sentences each. The crust is the topmost solid rock layer that makes up 0.5% of the Earth's mass. Below is the mantle, which is thicker and denser than the crust and comprises 10% of the Earth's mass. The innermost layer is the core, which is primarily composed of iron and nickel and can be divided into a solid inner core and liquid outer core.

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Layers of the earth
The crust of the earth is very slowly growing thicker. Volcanic activity is continually adding mass to the crust. Though the crust is solid it is.
The crust is about 0.5 % of the earths total mass. The crust is made up of silicate rocks such as granite and basalt.
Layers of the earth
Oceanic crust - The crust under the oceans is about 10 km thick and is generally made up of rock rich in iron and magnesium. These are primarily basalt formed by volcanic action at the mid ocean ridges. The oceanic crust is denser than continental crust.
Continental crust (continental cratons) - Where there are continents the crust is about 30 to 50 km thick. It is made up of igneous, metamorphic, and sedimentary rocks. The continental crust is less dense than the oceanic crust.
Layers of the earth
Largest layers of the Earth. Much less is known about the mantle than the crust. The crust we can see, measure, dig and drill. The mantle is different. We have little direct contact with the inner earth. We can tell some things about the mantle by studying volcanoes and what comes out of them.
Layers of the earth
Layers of the earth
Is made up of rocks rich in magnesium and iron. It is about 400 km thick and is much denser than the crust. It comprise 10% of the earths mass
Layers of the earth
It is more dense and contains a greater amount of iron than the upper mantle It is about 1900 km thick It makes up 41% of the earths mass
Layers of the earth
The core is composed primarily of a nickel- iron alloy. There is an outer core that is liquid and an inner core that is solid.
Layers of the earth
Layers of the earth
Inner and Outer core
Outer core is about 2100 km thick. It makes up about 30 % of the Earth's total mass.
Inner core is about 1300 km thick. It makes up about 2 % of the Earth's total mass.
Layers of the earth

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Layers of the earth

  • 2. The crust of the earth is very slowly growing thicker. Volcanic activity is continually adding mass to the crust. Though the crust is solid it is.
  • 3. The crust is about 0.5 % of the earths total mass. The crust is made up of silicate rocks such as granite and basalt.
  • 5. Oceanic crust - The crust under the oceans is about 10 km thick and is generally made up of rock rich in iron and magnesium. These are primarily basalt formed by volcanic action at the mid ocean ridges. The oceanic crust is denser than continental crust.
  • 6. Continental crust (continental cratons) - Where there are continents the crust is about 30 to 50 km thick. It is made up of igneous, metamorphic, and sedimentary rocks. The continental crust is less dense than the oceanic crust.
  • 8. Largest layers of the Earth. Much less is known about the mantle than the crust. The crust we can see, measure, dig and drill. The mantle is different. We have little direct contact with the inner earth. We can tell some things about the mantle by studying volcanoes and what comes out of them.
  • 11. Is made up of rocks rich in magnesium and iron. It is about 400 km thick and is much denser than the crust. It comprise 10% of the earths mass
  • 13. It is more dense and contains a greater amount of iron than the upper mantle It is about 1900 km thick It makes up 41% of the earths mass
  • 15. The core is composed primarily of a nickel- iron alloy. There is an outer core that is liquid and an inner core that is solid.
  • 19. Outer core is about 2100 km thick. It makes up about 30 % of the Earth's total mass.
  • 20. Inner core is about 1300 km thick. It makes up about 2 % of the Earth's total mass.