| A | B |
|---|
| natural resources | materials in the natural environment that people value |
| renewable resources | natural resources replaced by the environment |
| nonrenewable resources | natural resources that cannot be replaced |
| fossil fuels | fuels- coal, oil and natural gas, that are formed from the remains of ancient plants and animals |
| nuclear energy | energy produced by fission, the splitting of uranium atoms |
| water power | uses the energy of falling water to move machines |
| geothermal energy | energy that comes from the earth's internal heat |
| solar energy | energy produced by the sun |
| subsistence farming | people grow only enough food for their own family |
| commercial farming | the production of food and other agricultural products for sale in markets |
| exports | goods that are sent out of the country |
| imports | goods that are brought into the country |
| GDP | the total value of goods and services produced within a country in a year |
