Are Alligators the Same as Crocodiles?
Are Alligators the Same as Crocodiles? No, but it often takes a very close look to see the difference. They are both long, scaly reptiles with long snouts and sharp...
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Why Does Iron Rust?
The metal iron combines chemically with oxygen when there is moisture in the air, and the result is the reddish substance we call rust. Iron and steel rust when they...
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Do Fish Drink Water?
Yes, fish drink water. In fact, fish that live in the ocean drink considerably more water than freshwater fish. Ocean fish must gulp water constantly because the salty...
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Why Is the Ocean Salty?
Why Is the Ocean Salty? The salt in the ocean comes from the earth’s crust. Since the very beginning of the earth’s history, water on its surface has been...
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What Causes the Ocean Tides?
What Causes the Ocean Tides? The rise and fall of the tides are caused mainly by the pull of gravity from the moon on the earth’s waters. The moon pulls up the...
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