Natural Science CLEP Prep 2025 – 400 Free Practice Questions to Pass the Exam

Question: 1 / 400

What is most of Earth's water found in?

Reservoirs

Rivers and streams

Aquifers

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.

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