What Makes the Wind?
What Makes the Wind? Wind is the movement of air across the surface of the earth, caused by warm air rising and being replaced by cooler air. Except for the monsoons,...
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When Does Sheet Lightning Occur?
When Does Sheet Lightning Occur? Sheet lightning usually occurs during a storm as the result of a discharge of excess electricity within a single thundercloud. The...
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When Does a Geyser Occur?
When Does a Geyser Occur? A geyser occurs when a hot spring erupts, hurling a column of water and steam high into the air. These springs are situated in regions which...
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Where Is the World’s Highest Mountain?
Where Is the World’s Highest Mountain? The world’s highest mountain is Mount Everest, on the Nepal—Tibet frontier in the eastern Himalayas. Mount Everest was named...
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How Can Scientists Control the Weather?
How Can Scientists Control the Weather? Since the 1940’s scientists have discovered techniques by which several weather conditions can be controlled. For example,...
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What Is Twilight?
What Is Twilight? Twilight is the faint light which appears a little before sunrise and again after sunset before it gets really dark. On the Moon there is no twilight....
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Why are Contour Lines used on Maps?
Why are Contour Lines used on Maps? Contour lines are used when maps are designed to show the physical nature of the land. They do this by linking all points which are...
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Why Does India Have Monsoons?
Why Does India Have Monsoons? The seasonal winds of southwest Asia known as monsoons are associated particularly with India because of the tremendous effects they have...
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What Is Vaccination and Why Is It Used?
The administration of vaccines is called vaccination. Vaccination is the most effective method of preventing infectious diseases; widespread immunity due to vaccination...
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When Does Coal Become a Precious Stone?
When Does Coal Become a Precious Stone? Coal is basically a compound consisting largely of carbon. When a piece of carbon deep underground is subjected to great heat...
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