Savanna is grassland with scattered individual trees. Savannas of one sort or another cover almost half the surface of Africa (about five million square miles, generally central Africa) and large areas of Australia,
The greatest common factor of 100 and 20 is 20!
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an avalanche of rock or a mass of stony materials
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low-density - having low relative density or specific gravity. light - of comparatively little physical weight or density; "a light load"; "magnesium is a light metal--having a specific gravity of 1.74 at 20 degrees C" 2.