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It is a sedimentary rock made up of loosely structured, rough grains of rock.
A glacier is a large body of ice that forms from snow, and is in constant, slow motion.
Wind, as an external force, plays an important role in shaping deserts.
The last Ice Age ended about 13 thousand years ago.
This animation demonstrates different types of soil.
Physical properties, as well as the flora and fauna of the ocean change with depth.
Waves play an important role in forming the coast.
The four outer planets (Jupiter, Saturn, Neptune and Uranus) do not have solid surfaces, thus...