How much do you know about our planet’s water supply? It might be a lot or very little, but how much you know is not as important as how much you care. Our water supply is a precious resource because it is what sustains life for all the living beings, human or otherwise, here on Earth.
So let’s start with the easy stuff. How much of the earth’s surface is covered by water? About 80%. You knew that one, right? See how many of the next group you can guess correctly. The answers are at the bottom of the post.
- What is the most common substance found on earth?