earths layers

layers by composition

The layers scientists recognize are pictured below (Figure 1.1). Core, mantle, and crust are divisions based on composition: 1. The crust is less than 1% of Earth by mass. The two types are oceanic crust and continental crust.Continental crust is felsic and oceanic crust is mafic. 2. The mantle is hot, ultramafic rock. It represents about 68% of Earths mass. 3. The core is mostly iron metal. The core makes up about 31% of the Earth.

layers by mechanical properties

Lithosphere and asthenosphere are divisions based on mechanical properties: 1. The lithosphere is composed of both the crust and the portion of the upper mantle and behaves as a brittle, rigid solid. 2. The asthenosphere is partially molten upper mantle material and behaves plastically and can flow. A cross section of Earth showing the fol- lowing layers: (1) crust (2) mantle (3a) outer core (3b) inner core (4) lithosphere (5) asthenosphere (6) outer core (7) inner core. Click image to the left or use the URL below. URL: Click image to the left or use the URL below. URL:

textbook_image

instructional diagrams

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questions

the layers of earth from inside to out are

a) core, crust, mantle

-->  b) core, mantle, crust

c) crust, mantle, core

d) mantle, core, crust

what is true about the crust?

a) the crust is less than 1% of earths mass

b) there are two types of crust, continental and oceanic

c) it is the outermost layer

-->  d) all of the above are true

the lithosphere is the lower part of the mantle.

a) true

-->  b) false

which of these statements is not true about the mantle?

a) the mantle is extremely hot.

b) it is about 68% of earths mass

-->  c) the entire mantle can be divided into two parts, lithosphere and asthenosphere.

d) it is made of ultramafic rock.

the lithosphere is made up of both crust and the uppermost mantle.

-->  a) true

b) false

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

a) turbosphere

b) mesosphere

-->  c) lithosphere

d) asthenosphere

continental crust is

-->  a) felsic

b) mafic

c) ultramafic

d) metallic

the core is

a) felsic

b) mafic

c) ultramafic

-->  d) metallic

the oceanic crust is mafic.

-->  a) true

b) false

the asthenosphere is a solid but it can flow.

-->  a) true

b) false

diagram questions

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