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
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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3
Published in 2006
Water is a crucial ingredient for life on Earth: It nourishes people, plants, and animals and plays a majr role i nthe planet's weather and climate. The water cycle is Earth's natural mechanism for transporting, cleansing, and recycling water between the surface and the atmosphere. In this lesson,...
Grade Level   3 4 5
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4
There is water all over Earth in different forms. By far, most of the planet's water is in the oceans, but it is in other places as well. Sometimes water is a liquid, sometimes it is a solid, and sometimes it is a gas. These changes in the states of matter are the result of the water either gaining...
Grade Level   5 6
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5
Water in its liquid state is visible, as ponds, streams, water in bottles, and wet surfaces. You can also see water in its solid form , ice and snow. Water as a gas in the air, also called water vapor, is invisible. The process of visible liquid water turning into invisible gaseous water is called...
Grade Level   5 6
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6
All of the water on Earth is part of a never-ending cycle called the water cycle. Water evaporates (becomes gas) from the surface of the Earth, condenses in the atmosphere as clouds, falls to the Earth as precipitation and then evaporates again, starting the whole process over. In this activity,...
Grade Level   3 4 5
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