Natural Science CLEP Prep Practice Exam

Disable ads (and more) with a membership for a one time $2.99 payment

Prepare for the CLEP Natural Science Exam with our comprehensive study materials and practice questions. Test your knowledge and ace the exam by mastering key concepts.

Each practice test/flash card set has 50 randomly selected questions from a bank of over 500. You'll get a new set of questions each time!

Practice this question and more.

What is most of Earth's water found in?

Reservoirs
Rivers and streams
Aquifers
Oceans

The correct answer is: Oceans

Most of Earth's water is found in our oceans. According to the USGS Water Science School, approximately 96.5% of Earth's water is found in our oceans. Additionally, none of the other options are accurate as reservoirs, rivers, and aquifers only contain a small fraction of Earth's total water supply. Aquifers, while containing more water than rivers and streams, still only account for a small percentage of Earth's water. It is estimated that only 0.76% of Earth's water is found in lakes, rivers, and streams combined. Reservoirs, which are man-made water storage systems, only account for an even smaller fraction of Earth's total water supply.