Multiple choice

The ocean holds how much of Earth’s water supply?

  1. About half

  2. About 60 percent

  3. About 97 percent

  4. All of it

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Approximately 97 percent of Earth's water is saline and stored in the oceans. The remaining 3 percent is freshwater, mostly locked up in glaciers, ice caps, and underground aquifers.