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Groundwater and aquifers are types of underground waters.
The four outer planets (Jupiter, Saturn, Neptune and Uranus) do not have solid surfaces, thus...
Sea and land breeze form because of the differing warming of land and sea.
Physical properties, as well as the flora and fauna of the ocean change with depth.
Rivers play an important role in shaping the Earth's surface: they cause erosion as well...
Karst formations include dolines and dripstones.
Plate tectonics is a theory dealing with the movement of plates.
This video presents the different stages of coal formation.