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.

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.

Renewable resources are resources that can be replaced in a short time. Examples of renewable resources include:

1. Solar Energy: Solar power is generated by harnessing the energy from the sun through solar panels. This energy source is constantly replenished and can be used to generate electricity or heat.

2. Wind Energy: Wind turbines convert the kinetic energy of the wind into electricity. Wind is a renewable resource as it is replenished by natural processes.

3. Biomass: Biomass refers to organic matter derived from plants or animals. It can be used to produce energy through processes such as combustion or fermentation. Sources of biomass include crop residues, wood, and energy crops.

On the other hand, nonrenewable resources cannot be replaced or can only be replaced over millions of years. Examples of nonrenewable resources include:

1. Fossil Fuels: Fossil fuels, such as coal, oil, and natural gas, are formed from ancient organic matter over millions of years. Once these resources are extracted and burned for energy, they cannot be replenished in a human timescale.

2. Minerals: Many minerals, such as iron, copper, and aluminum, are nonrenewable resources. They are mined from the earth's crust and do not naturally replenish within a short time.

3. Nuclear Fuels: Uranium, which is used as fuel for nuclear power plants, is a nonrenewable resource. It is extracted from the earth and has a limited supply.

It is important to note that the use of nonrenewable resources contributes to environmental degradation and climate change, hence the increasing focus on renewable energy sources to meet our energy needs in a sustainable manner.