lithosphere and asthenosphere

lithosphere

The lithosphere is composed of both the crust and the portion of the upper mantle that behaves as a brittle, rigid solid. The lithosphere is the outermost mechanical layer, which behaves as a brittle, rigid solid. The lithosphere is about 100 kilometers thick. How are crust and lithosphere different from each other? The definition of the lithosphere is based on how Earth materials behave, so it includes the crust and the uppermost mantle, which are both brittle. Since it is rigid and brittle, when stresses act on the lithosphere, it breaks. This is what we experience as an earthquake. Although we sometimes refer to Earths plates as being plates of crust, the plates are actually made of lithosphere. Much more about Earths plates follows in the chapter "Plate Tectonics."

asthenosphere

The asthenosphere is solid upper mantle material that is so hot that it behaves plastically and can flow. The lithosphere rides on the asthenosphere.

instructional diagrams

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questions

the lithosphere and asthenosphere are both part of this layer.

a) crust

b) mantle

c) core

-->  d) none of the above

this layer is made up of both the crust and uppermost mantle.

a) asthenosphere

b) mesosphere

-->  c) lithosphere

d) none of the above

the main characteristics of the lithosphere are that it is a

-->  a) brittle solid.

b) solid that can behave plastically.

c) liquid.

d) none of these.

the main characteristics of the asthenosphere are that it is a

a) brittle solid.

-->  b) solid that can behave plastically.

c) liquid.

d) none of these.

how are the crust and lithosphere different from each other?

a) the lithosphere is in the mantle and the crust is the crust.

b) the lithosphere is a solid that can behave plastically and the crust is brittle.

c) the crust is made of rocks of more different compositions than the lithosphere.

-->  d) the lithosphere includes the crust and also the uppermost mantle.

the lithosphere rides on the asthenosphere.

-->  a) true

b) false

earths plates are above this layer of the mantle.

a) lithosphere

-->  b) asthenosphere

c) both layers

d) none of these layers

why do scientists need the terms crust, mantle and core, and also lithosphere and asthenosphere?

-->  a) the first are based on composition, the second are based on mechanical properties.

b) the first divide mafic materials and the second divide felsic materials.

c) the first are based on knowledge from seismic waves and the second from meteorites.

d) to make it sound more scientific.

stresses on the lithosphere may cause it to break and cause an earthquake.

-->  a) true

b) false

scientists need the terms crust, mantle and core and also lithosphere and asthenosphere because the first is based on mechanical properties and the second is based on composition.

a) true

-->  b) false

diagram questions

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