Multiple choice

There are 366 quintillion gallons of water on Earth.  ____% percent is potable (safe to drink).

  1. 0.007%

  2. 0.07%

  3. 0.7%

  4. 7%

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

While Earth has vast amounts of water, only a tiny fraction is fresh and accessible for human consumption.