Tag Archives: Rivers

What is the difference between a lake and a pond?

Generally, a pond is described as a small body of still water without an outlet.  Lakes are usually much larger and deeper and often are fed by rivers and streams. Generally, lakes differ from ponds in size.  A lake is commonly descried as a large body of water with land all around it. A pond …

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Why is it cooler in the mountains?

Probably  you have noticed that it is usually much cooler in the mountains than in nearby lowland places. This is because the higher  up you go, the less air there is above you.  The air becomes colder because it cannot absorb as much heat as it is able to hold at sea level. Perhaps the …

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How does a hydroelectric plant work?

Much of the electricity we use is produced by power plants located in huge dams.  Such plants, called hydroelectric plants, are run by the force of falling water. The water collects behind the dam.  It rushes down through an enclosed pipe and pushes against the blades are connected to a shaft which turns the generator. …

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What is an aqueduct?

A big city needs a lot of water.  Some cities are near big lakes or rivers.  They find it easy to get enough water. But very often the lakes or reservoirs upon which a city depends for water are many miles from the city.  Then aqueduct must be built. The word “aqueduct” comes from two Latin …

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