What Is Motocross and How Did It Begin?
Motocross is a type of motorcycle racing. The riders take their bikes on off-road tracks full of rough terrain. They race over hills and around sharp turns. The tracks...
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When Does a Hill Become a Mountain?
When Does a Hill Become a Mountain? There is no exact rule that indicates when a hill becomes a mountain. But scientists who study the surfaces of the Earth usually...
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What Are the Dark Spots on the Moon?
The dark spots we see on the moon are really the moon’s large flat plains. The moon’s rugged surface is covered with mountains, craters, and great lava...
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