Which is true for all renewable energy resources?
a. they are continuously replenished by natural processes.
b. they all formed deep within the earth over millions of years.
c. they can be used in their extracted form without further refinement.
d. they are made of recycled manufactured products.

The answer is a. They are continuously replenished by natural processes. 

Renewable energy resources can be defined as resources that are continuously replenished by natural processes. These resources are sunlight, rain, geothermal heat, wind, tides, and waves. They should be distinguished from non-renewable energy resources which could not be replenished by natural processes, such as natural gas, fossil fuels, coal, etc. They could not be regenerated unlike sunlight or wind for example.

The answer that is true for all renewable energy sources is that A) they are continuously replenished by natural processes. 

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