Q: Answer the question

A student climbs up a rocky mountain trail in Maine. She sees many small pieces of rock on the path. Which action most likely made the small pieces of rock?

A: ice breaking large rocks apart

Q: Answer the question

Measurements of carbon dioxide concentrations in the air taken over the past decade have shown a

A: dramatic increase.

Q: Answer the question

Many birds fly south for the winter. This adaptation is called

A:
migration