Earth’s Structure: Lesson Eight

Part One: Video Lesson

Part Two: Practice Questions

1. Plate tectonics suggests that the earth’s continents are like puzzle pieces that fit together. Which of the following seems to provides evidence of this theory?

A. That India is connected to Asia.
B. That it seems possible for Africa to fit into the east coast of America.
C. That America and Greenland are both in the Northern Hemisphere.

Answer: B. That it seems possible for Africa to fit into the east coast of America.

2. Which of the physical descriptions best explains the shape of the Earth?

A. It is a sphere that with four main interior layers.
B. It is a sphere that has two poles, which stretch east and west.
C. It is a sphere that is flattened at the poles and reaches its widest point at the equator.

Answer:C. It is a sphere that is flattened at the poles and reaches its widest point at the equator.

3. Which choice best completes the sentence, “The theory of plate tectonics____”:

A. explains why continents on the earth’s crust shift over time
B. describes the composition of the mantle
C. explains the effects of heat and pressure in the Earth’s core

Answer:A. explains why continents on the earth’s crust shift over time