Earth's Interior


Before I begin, here is some helpful vocab.

Pressure-The force pushing on a surface divided by the area of the surface. (Earth's structure, interactive science book)

Basalt-a rock that is fine and dark.

Granite-a rock that is coarse and light-colored.

The Crust

The crust is normally 5 to 40 kilometers thick. It is 5 kilometers under oceans. There are 2 kinds of crust, the continental crust, that makes up the continents, and the oceanic crust that that is under oceans.

The oceanic crust is made of basalt. Almost all of the oceanic crust is basalt.

The continental crust is made of granite. But there a lot of other rocks.

The Mantle

The mantle consists of 3 main parts, the lithosphere, the Asthenosphere, and the Mesosphere. The mantle is a total of about 3,000 kilometers thick.

The lithosphere is the first layer. It is 100 kilometers thick. It is a rigid and strong rock.

The asthenosphere is the second layer of the mantle. The rock here is not as rigid and can bend over time. It is also hotter.

The mesosphere is the third layer. It is rigid and very hot. It is also very stiff.

Just below the asthenosphere is the transition zone. The transition zone is part of the mesosphere.

The Core

The outer core is liquid metal. It, along with the inner core is mostly nickel and iron.

The inner core is the same thing only it is under so much pressure it is solid. Scientist now believe that there might be some silicon, sulfur, and oxygen in the core as well.

How Geologists Learn About Earth's interior.

Geologists learn about the Earth's interior by drilling holes and using the rock samples. They also Analyze rocks from volcanoes.

They also learn about our earths interior by analyzing the seismic waves.


Earth's structure interactive science book