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Water on Earth is in a continuous state of change. The water cycle includes processes...
Natural gas and petroleum are among the most important sources of energy and raw materials today.
The last Ice Age ended about 13 thousand years ago.
The most important types of local winds are the sea-land breeze, the mountain-valley...
The boundaries of tectonic plates can be seen on the seafloor.
Wind, as an external force, plays an important role in shaping coastal areas and steppes.
Seawater, as an external force, plays an important role in shaping coastlines.
One third of the continents is covered with desert. Today, desertification is a growing problem.