1
There are three states of matter: gas, liquid, and solid. Water in our atmosphere exists in these three states constantly. As the temperature of water vapor (a gas) decreases, it will reach the point at which it turns into a liquid (called the dew point or the point at which dew forms). This change...
Grade Level   3 4 5 6 7 8 9 10 11 12
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2
There are two methods water moves from the ground to the atmosphere as part of the hydrologic cycle. Transpiration is basically evaporation of water from plant leaves. Studies have revealed that transpiration accounts for about 10% of the moisture in the atmosphere, with oceans, seas, and other...
Grade Level   5 6 7 8 9 10 11 12
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3
This is the first of three lessons thta have been developed to teach students about Earth's water cycle, the importance of freshwater resources, and how NASA studies water in Earth's systems.
Grade Level   K 1 2 3 4 5 6 7 8 9 10 11 12
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4
Water is the most abundant and important substance on Earth. It is essential to life and is a major component of all living things. There are approximately 336,000,000,000,000,000,000 gallons of water on Earth, existing in three states: solid, liquid, and gas. The sources for this water storage are...
Grade Level   6 7 8 9 10 11 12
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