Chapter 22 Review
Chapter 22 page 598
1. What is the commonly accepted age of Earth?
a) 4.6 Billion years
2. Which of the following was not a source of heat for the early Earth?
a) hydrothermal energy
3. What are small asteroids called?
a) meteoroids
4. What is the process by which a planet becomes internally zoned when heavy materials toward its center and lighter materials accumulate near its surface?
a) Diffentiation
5. Where is most of the North American Precambrian shield exposed at the surface?
a) Canada
6. What mineral can be used to radio metrically date Earth's age?
a) zircon
7. Refer to Figure 22-6. What name is given to the core of the modern-day North American continent that formed in the Proterozoic?
a)Laurentia
8. What is the name of the first super continent which formed near the end of the Proterozoic?
a) Laurentia
9) What volcanic process most likely formed Earth's atmosphere?
a) differentiation
10) Why is ozone a necessary component of Earth's atmosphere?
a) It......
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