The chemical or mechanical process by which rock is gradually broken down eventually becoming soil

Soil forms continuously, but slowly, from the gradual breakdown of rocks through weathering. Weathering can be a physical, chemical or biological process: physical weathering—breakdown of rocks from the result of a mechanical action.Oct 8, 2013

the only other powers were germany russia and uk and they were too busy fighting each other wearing each other down   that the us was becoming strong and they were becoming weaker

the following sets of characteristics describe what we know about the outer plants is c. rocky surface, closet to the sun and larger in size