Answers

2014-06-14T15:05:41+05:30
1.the earth surface is covered by a series of crustal plates 
2. the ocean floors are continually moving spreading from the center , sinking at the edges, and being regenerated 
3. convection currents beneath the plates move the crustal plates  in different directions
4. the source of heat driving the convection current is radioactivity  deep in the earth mantle 
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