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Defend Earth from alien invaders
(geology) the mechanical process of wearing or grinding something down (as by particles washing over it).
the natural process of laying down a deposit of something.
(physics) the force of attraction between all masses in the universe.
the removal of fine sediment by wind .
hills of sand formed by the wind.
a fine-grained unstratified accumulation of clay and silt deposited by the wind.
large, thick body of slowly moving ice.
the rock material carried and deposited by glaciers.
form at high elevations where temperatures remain cold enough during the summer to keep the previous winter's snow from melting allowing snow and ice to accumulate., A glacier confined to a mountain valley, which in most instances had previously been a stream valley.
extremly slow movement of material down slope.
Type of mass movement that involves the detachment and movement of a small block of rock from a cliff face to its base. Normally occurs when the rock has well defined bedding planes that are exaggerated by freeze-thaw action or thermal expansion and contraction.
A downslope movement of rock and soil over a failure surface and under the influence of gravity. Slumps, earthflows, debris flows and debris slides are examples.
quickly moving downhill flow of soil and rock fragments containing a large amount of water.
soucre of most icebergs.
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