When you think of a desert, you probably imagine a hot, dry place with cacti or sand dunes

Not only do mountains tower above the land surrounding them, they affect it in many ways.

Tundra is a Russian word meaning «treeless». Indeed, the tundra is an area of...

The polar regions at each end of the earth’s axis are alike...

At the southern end of the earth’s axis, Antarctica presents a fascinating...

Glossary of terms