1
The Earth is in constant motion. Each day the earth makes one complete rotation. Each year, the earth makes one orbit of the sun. The first motion is obvious. The second one, however, is muh harder to notice except over a much longer period and can be made visible only by some time and some...
Grade Level   3 4 5 6 7 8 9 10 11 12
Classroom Activities Curricula and Instruction
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2
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
Classroom Activities Curricula and Instruction
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