5. What can scientists learn from studying and measuring the size of sand grains at a beach? 6. How do waves affect the smoothness of sand grains? 7. Beach sand is made mostly of what two minerals? 8.

5. What can scientists learn from studying and measuring the size of sand grains at a beach?

6. How do waves affect the smoothness of sand grains?

7. Beach sand is made mostly of what two minerals?

8. What causes waves?

9. What three factors affect the height of a wave?

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5. What can scientists learn from studying and measuring the size of sand grains at a beach? 6. How do waves affect the smoothness of sand grains? 7. Beach sand is made mostly o…

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