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Meteors, Meteorites and Impact Craters

The solar system contains many objects smaller than the planets (or their satellites) travelling in individual orbits about the SUN; space between the planets also contains myriad dust grains in the micron size range. Near Earth, dust concentrations are only a few hundred particles per cubic kilometre, but 35 000 to 100 000 t of extraterrestrial material enters the atmosphere annually, swept up by our planet from debris that is in its path or crosses its path.

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Cave

Origins Lava tube caves, an important minor class, are formed by channelled outflow of molten lava in congealing flows. Sea caves most commonly result from erosion by waves.

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Badlands

Badlands are dramatic landforms characterized by a network of deep, narrow and winding gullies, along with occasional hoodoo rocks. Their steep, barren slopes provide striking evidence of the force of erosion by wind and water — a source of continual change in their terrain.