1. How does a texture of a rock surface affect how fast it can be physically weathered by water?

2. Why do scientists know very little about life in the Precambrian eon?

3. What evidence is there that oxygen levels in the sea increased due to photosynthetic bacteria?

4. What provides evidence of an increase in animal species at the same time that atmospheric oxygen concentrations increased?

5. The Rocky Mountains began forming in the western United States about 60 million years ago. The Appalachian Mountains and the Rocky Mountains were similar in height when they first formed. Which statement about the Rocky Mountains are true?

6. Which of the following are ways that humans can help protect coral reefs and prevent erosions to coastlines?

7. Which best describes the physical weathering of a rock by water?

8. Which describes the Grand Canyon as it will be one million years from today?

9. Which fact can you say is certain only by reading the geologic time scale?

10. Which form of chemical weathering most efficiently erodes limestone?

Which of the following events happened SECOND in the development of Plants

12. What term describes physical weathering due to collisions between sand and sediment carried in moving water and the rock surface over which the water flows?

13. What is an example of a physical weathering?

14. Which process is an important part of chemical weathering through oxidation?

15. In a small bay that contains a coral reef, the water temperature has remained the same for decades. Recently, scientists discovered that the water temperature in the bay has increased by 1°C. Which is most likely to happen?

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