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Which lake is the oldest in the world?

Caspian Sea

Lake Superior

Lake Victoria

Lake Baikal

Lake Baikal is the deepest and the oldest lake, at least 25 million years old. It was formed as an ancient rift valley. Due its age, size and isolation, it hosts about 1000 endemic species of plants and animals (which can be found nowhere else in the world).

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Which of the following European mountain ranges will rise the most in the next century?

Carpathian Mountains

Scandinavian Mountains

This kind of tilted forest is a common sight in subarctic taiga. What is this phenomenon caused by?

low sun position

Which area of the following is the most likely to become an island in the future?