1) Approximately what percentage of the Earth's surface is covered by oceans?
2) What is the deepest known point in the ocean?
3) What type of animal is a starfish?
4) How many oceans are there in the world?
5) What is the average depth of the ocean?
6) What is the name of the second largest ocean in the world?
7) What is the name of the longest mountain range in the world?
8) What percentage of life on Earth is found in the oceans?
9) What is the ocean's most abundant gas?
10) What percentage of the Earth's surface is covered by the ocean?