Chapter 18: Plate Tectonics

How is continental drift different from plate tectonics?

-continental drift considered only continents to move -there was not a reason given for continents to move -continents moved as a breakup of a single large landmass

What evidence provides information about the nature of the earth's core?

-earthquake waves -the nature of meteorites -mass of the earth All of the above.

According to the accepted theory, Earth has a core composed mostly of iron because

Earth melted and the heavier iron sank and accumulated near the center.

Which part of the earth makes up about one-third of earth's total mass and is mostly iron with a solid part and a part that acts like a liquid?

core.

Which part of Earth is a thin skin that covers the entire surface, existing beneath oceans as well as making up the continents?

crust.

Which of the following contains part of the lithosphere, all the asthenosphere, and has a solid, dense lower part?

mantle.

Which part of Earth accounts for about two-thirds of its total mass and is mostly silicate minerals such as olivine?

mantle.

What is the origin of the magnetic strip patterns found in rocks along an ocean ridge?

new crust moving from the ridge becomes magnetized in different directions as the magnetic field of Earth flipped.

Rocks, sediments, and fossils around an ocean ridge have a pattern concerning their ages. What is the pattern?

all are older as you move away from the ridge.

The lithosphere is broken into a number of fairly rigid plates that move in what part of the earth?

asthenosphere.

Which of the following is a part of the mantle below the lithosphere and is a relatively thin plastic layer?

asthenosphere.

Which part of the earth is a hot, elastic semi-liquid layer that extends around the entire Earth?

asthenosphere.

The early idea that individual continents could shift positions on Earth's surface was called

continental drift.

Which of the following includes the entire crust, the Moho, and the upper part of the mantle?

lithosphere.

Which of the following is the outer layer of Earth that includes the Moho?

lithosphere.