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This lesson presents deserts and their flora and fauna.
Water covers about 71% of the Earth’s surface. But why are there two types of water on Earth,...
Icebergs are blocks of frozen freshwater floating in the sea.
The last Ice Age ended about 13 thousand years ago.
When masses of cold and warm air meet, weather fronts develop.
Karst formations include dolines and dripstones.
Groundwater and aquifers are types of underground waters.
Human activity increases the greenhouse effect and leads to global warming.