What Is the Tundra?
Tundra is the name given to the cold, treeless plains. It is a type of biome where the tree growth is hindered by low temperatures and short
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What Causes a Mirage?
What Causes a Mirage? Desert travelers often tell of seeing distant pools of water, only to have the water disappear when they drew near. Th
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
What Is the Liquid in a Thermometer?
What Is the Liquid in a Thermometer? Most thermometers are sealed glass tubes with liquid inside. The liquid is either mercury, which is sil
How Do Fish Live in a Frozen Pond?
How Do Fish Live in a Frozen Pond? Anyone who has fished through a hole in the ice knows that many fish are active in the winter. Usually, w