the Earth

Since the moon's orbit around the Earth is egg-shaped, sometimes during the month-long lunar cycle the moon is at its shortest distance from Earth; other times it's farthest away.

In fact over the past 650,000 years, the Earth has gone through seven ice ages and warming periods.

That’s why many scientists agree that the Earth is now warming because of human activity.

The Earth’s average temperature has increased about 1.5°F in the past hundred years.

Because disease-carrying mosquitoes thrive in warm, wet weather, more people could contract illnesses such as malaria as the Earth warms.