How Is Sound Produced?
How Is Sound Produced? Sounds travel in waves. If you throw a pebble into a still pond, you will see ripples, or waves, spread outward from the point where the pebble...
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What Are Sunspots?
Sunspots are dark, relatively cool spots on the surface of the sun in a region called the photosphere. Sunspots have temperatures of about 3,800 degrees K. They can be...
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How Fast Does Light Travel?
How Fast Does Light Travel? Light travels very fast. In just one second, it goes 186,282 miles (229,792 kilometres), and at this speed takes about eight minutes to...
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What Makes Waves in the Ocean?
What Makes Waves in the Ocean? Most waves in the ocean are caused by the wind. Somewhere, far out at sea, wind ruffles the surface of the water. Ripples form and grow...
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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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