Day and night are caused by

Earth's rotation takes about

One complete revolution of Earth around the sun takes about

Earth has seasons because

When the north end of Earth's axis is tilted toward the sun, North America will experience

In the Northern Hemisphere, the summer solstice occurs when the sun is directly overhead at

An equinox occurs when

Earth rotates around an imaginary line that passes through the center of the Earth called

The path that Earth takes as it revolves around the Sun is called the

This occurs on March 21st and marks the beginning of spring each year.

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