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Online focus groups gather data from large and geographically diverse groups in a less intensive manner than focus-group interviews.
Seasonal Effects
The variations in natural or social phenomena that occur at specific times of the year due to Earth's changing position relative to the sun.
Isotopes
Variants of a particular chemical element that have the same number of protons but different numbers of neutrons.
Evaporation
The process by which water changes from a liquid to a gas or vapor, a key part of the Earth's water cycle and energy balance.
Precipitation
Any form of water, liquid or solid, that falls from the atmosphere and reaches the ground, including rain, snow, sleet, and hail.
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