What Causes Earthquakes?
What Causes Earthquakes? Earthquakes happen when two large pieces of the Earth’s crust suddenly slip. This causes shock waves to shake the s
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Surface
How Does Coral Grow?
How Does Coral Grow? Beneath the surface of the sea lie coral formations of many shapes and colors. The formations may look like branching t
Where Do Volcanoes Begin?
Where Do Volcanoes Begin? Volcanoes begin deep inside the earth. The earth’s crust is made up of giant pieces of rock called plates. Volcano
What Were the First Mirrors?
What Were the First Mirrors? Probably the first mirror was the surface of a quiet pond. Our earliest ancestors must have noticed that they c
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