The first blank can be filled with "Wind energy" or "Solar energy" as they are examples of renewable resources.
The second blank can be filled with "Fossil fuels" such as coal, oil, and natural gas, as they are examples of nonrenewable resources.
Choose
are renewable resources because they can be replaced in a short time.
Choose
are nonrenewable resources because they cannot be replaced or can only be replaced over millions of years.
1 answer