Which features of the ocean floor are found in the open ocean? Check all that apply.
- Ridge
- Trench
- abyssal plain
- continental slope
- continental shelf

What is the result of the greenhouse effect? a. heat is deflected from the atmosphere. b. heat is released from the atmosphere. c. heat is kept in the atmosphere. d. plants are able to grow in the tropics where the air is the heaviest.

The ozone hole is at its biggest each year in the ? hemisphere in the ? season.

How has the geography of india made it difficult for its people to expand before modern technology?