Final answer:
Cumulus clouds are described as white, puffy clouds with flat bottoms and rounded tops, often indicating fair weather.
Step-by-step explanation:
The student's question is describing a type of cloud. White, puffy clouds with often flat bottoms and rounded tops are known as cumulus clouds. These clouds are typically associated with fair weather but can grow into larger cumulonimbus clouds that may produce storms. Cumulus clouds are part of the larger water cycle and are formed when warm air rises and cools, causing the water vapor to condense into water droplets or ice crystals.