What Is Local Mean Sea Level?
What Is Local Mean Sea Level? Sea level is the base level for measuring elevation and depth on Earth. Because the ocean is one continuous body of water, its surface...
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How Do Scientists Measure the Depth of the Ocean?
How Do Scientists Measure the Depth of the Ocean? Historically, before scientists developed new techniques, the depth of the ocean was actually measured by sending a...
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What Causes an Echo?
What Causes an Echo? An echo occurs when sound bounces back from an object. When we speak or shout, sound waves travel through the air. We first hear the sound when the...
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Why Does Ice Float?
Ice is able to float because it is lighter than water. Water greatly expands as it freezes into ice. Ten quarts of water produce about eleven quarts of ice. Thus, ice...
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What Causes the Mists above Lakes and Ponds?
What Causes the Mists above Lakes and Ponds? The mist that may be seen above ponds and lakes on cold winter mornings and clear summer nights is sometimes called steam...
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