question: Write a question you would see in a school textbook. OPTIONS:
- blinking its eyes
- scratching an itch
- panting to cool off
- jumping to catch a ball
answer: Which dog trait is a learned behavior?

question: Write a question you would see in a school textbook. OPTIONS:
- expands
- contracts
- changes color
- becomes warm
answer: What happens to the physical state of water when it freezes?

question: Write a question you would see in a school textbook. OPTIONS:
- erosion.
- weathering.
- conservation of soil.
- deposition of sediment.
answer:
A delta can be seen from the air at the mouth of the Mississippi River. This delta was formed by