Tag Archives: Wind

What makes the wind blow?

Wind is caused chiefly by the uneven heating of the earth by the sun. All winds, from gentle breezes that rustle leaves to raging hurricanes, are caused chiefly by the uneven heating of the earth by the sun. When the air near the ground gets hot, it expands or swells.  This makes it lighter, and …

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What is a dune?

A dune is a hill or mound of sand drifted by the wind. A dune is a hill of sand.  Dunes are round along sandy shores of lakes and oceans and in sandy deserts. They are built by the wind.  At the wind blows, it piles the sand into hills that often look like ocean …

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What causes waves?

Water waves are caused mainly by the wind.  On a windy or stormy day there are many waves in the water, and on a calm day there are fewer waves. This explains what makes most waves in the water.  Winds push up waves on seas, lakes and ponds.  The waves you see on a calm …

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What is a timberline?

Some mountains have trees growing clear to their tops, but on many high mountains there is a line above which trees stop growing. The place where trees stop growing is called the “timberline”.  Trees don’t grow above it because they cannot survive the freezing temperatures there. Above the timberline the mountainside is likely to be …

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How was the grand canyon formed?

One of the great natural wonders of the world is Arizona’s Grand Canyon of the Colorado River.  The whole gorge is 217 miles long and, from rim to rim, 4 to 18 miles wide. One of the most amazing things about it is that it was made by a river!  Almost hidden between the canyon …

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