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Where do the lithosphere and the asthenosphere do coposition?
Question Date: 2016-10-14
Answer 1:

Our earth has a layered structure -- below the crust is the mantle, and then at the center of the earth is the core. The lithosphere and asthenosphere are the upper mantle, and they lie on top of the lower mantle. The crust always sits on top of the lithosphere and all along the base of the lithosphere is always the top of the asthenosphere.

We can tell the difference between the lithosphere and asthenosphere because they behave differently. The lithosphere is more rigid, and the asthenosphere is more elastic and molten.

These layers are very deep under the surface of the earth, so how do we know they exist? We use seismic waves. These are waves released by big events like earthquakes. Scientists measure the waves as they travel in the different layers of the earth. Due to the different behaviors of the lithosphere and asthenosphere, the waves appear different in each zone.

Answer 2:

The asthenosphere is made of the mineral olivine and other similar minerals. The lithosphere is made of different things in different places: crust in the continents is mainly quartz and various kinds of feldspar; crust in the ocean is mainly pyroxene, and the mantle lithosphere underneath them is made of olivine, like the rest of the mantle, but is not hot enough to be deformable like the asthenosphere.

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