solar energy is energy that is produced from the sun and is "caught" in solar panels
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I don't know the options but my best guess would be erosion. Every time water comes on the beach is takes sand which erodes the beach. Hope that helps!
It was discovered in 1972
Well fossils can tell you a lot about the age of the rock it was found in, and an index fossil are used to used to define periods of geologic time.