Chapter 26 Review

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Key Concept Summary

TA Summary


The temperature at which a material loses its magnetism.
A term we use here to describe the mechanical layer between the Asthenosphere and the outer core. It is solid, but still plastic and able to flow.
Meteorites that are believed to be similar to the material that formed Earth and other planets in the solar system.
These are thought to represent the type of material found in Earth's core.
The lower part of the core that is made of solid iron.
Minerals that contain silicon and oxygen bonded together.
Compression waves that arrive before shear waves at the seismic wave detectors.
The middle compositional layer of the Earth. A thick layer made up of peridotite in the upper part and higher density rocks of peridotite composition in the lower part.
The __________ of an earthquake is the point on the Earth's surface directly above the focus.
A region where seismic waves cannot be detected by seismometers.
A region of the upper mantle where seismic waves travel slower than expected.
A break in the lithosphere of the Earth along which earthquakes have occurred.
Rock made of mostly silicon, oxygen, iron, and magnesium that is denser than the basalt and granite that make up Earth's crust.
The point at which earthquakes originate.
Layer composed of solid, rigid crust and mantle rock.


The crust is mainly made up of peridotite.
The lithosphere is a rigid outer shell of the Earth, which consists of the crust and the outer most part of the mantle.
The outer core is made up of solid iron rock.
The deeper into Earth's center one goes, the more dense rock becomes.


What best describes the chemical composition of Earth's crust/core?
Which of the following provides evidence for a liquid core in the earth?
From the average density of Earth, we know that
The primary source of evidence that the earth is a differentiated planet comes from the study of
Of the following, which are compression waves?
The shadow zone for P waves provides evidence for
Which of the following is one piece of the evidence for an iron-nickel core in the center of the earth?
From Earth's average density, we know that:
What causes the S-wave shadow zone?
From the center to surface, the chemically distinct layers of Earth are:
Which of the following is one of the important sources of information about the interior structure of Earth?
What causes the P-wave shadow zone?
Most rocks found at the surface of the earth are ________ the entire planet.
Which of the following best describes, from surface to center, the chemically distinct layers of the earth?
The core of the earth is thought to consist mostly of which substance?
The asthenosphere lies entirely within what portion of the mantle?
The asthenosphere consists mostly of
Which of the following describes where most of our insight into the layered structure of the earth comes?

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