an imaginary line along the middle of the Earth, going from side to side.

Seasoned to the Tilt

Abel Torres Daniel S. Brehony

Have you ever thought about your favorite season, and why it looks and feels the way it does? This activity will help you see and understand why Earth has seasons, and the two things that work together to make seasonal changes happen.

Switching of Seasons

Sisi Gao

You might think that most places on Earth experience the changing of seasons because of the distance from the Sun. But, surprise, that's not the cause. Come and learn some new information to lean on about the tilt of the Earth. 

There tend to be more bugs in areas with warmer, tropical climates. The people in these areas also tend to be sick more often, and even have lower incomes. Scientists wanted to see if there was a relationship between the bugs in these tropical climates and people.

Trouble in the Tropics Anika Larson

This set of bits will teach you about one set of categories we use to describe the world around us: biomes.

Learn about biomes of the world Evan Brus

Searching the Savanna

Melinda Weaver

To a new visitor, the savanna may look just like a grassland with a few trees. But if you spend some time in the savanna, you learn it is quite different from other biomes.

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