What Is a Dam and How Does It Function?
Dam is a barrier built across a river or sea which is high enough to stop the water flowing over it. In a river dam, the water which is held back forms a reservoir....
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Why Are There Locks on Some Canals and Rivers?
Locks are watertight chambers which enable boats to ascend or descend to different levels in a canal or river. The lock is usually rectangular in shape with gates at...
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What Are the Panama Canal Locks?
What Are the Panama Canal Locks? The Panama Canal locks are a kind of water “stairway” that crosses the Isthmus of Panama and connects the Atlantic and...
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How Do We Hear Sounds?
How Do We Hear Sounds? When sounds are made, they set up movements in the air. These movements are called sound waves. The cup-like shape of the outer ear collects the...
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