Read the passage: The water cycle describes the continuous movement of water through Earth's systems. Driven by solar energy, water evaporates from oceans, lakes, and soil, rising as vapour into the atmosphere. As this vapour cools at higher altitudes, it condenses into tiny droplets that form clouds. When the droplets grow heavy enough, they fall as precipitation in the form of rain, snow, or hail. Some of this water flows over the surface into rivers and back to the sea, while a portion seeps into the ground, replenishing underground reserves known as aquifers. Vegetation also returns water to the air through transpiration. Because the total amount of water on Earth remains essentially constant, the cycle continually redistributes a finite resource rather than creating new water. Which choice best expresses the main idea?
AAquifers store most of Earth's water
BRain is the most important part of the water cycle
CSolar energy creates new water on Earth
DWater continuously cycles through Earth's systems, redistributing a fixed amount
Answer & Solution
Correct answer: D. Water continuously cycles through Earth's systems, redistributing a fixed amount
The passage's central claim is the continuous cycling/redistribution of a constant total — the final sentence makes this explicit.
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