| A | B |
|---|
| fossils fuels | coal, oil and natural gas |
| subsistence farming | farmers growing only enough food to feed their own families |
| natural resources | products of the earth that people use to meet their needs |
| renewable resources | resources that can be replaced as they are used up |
| nonrenewable resource | resources that cannot be replaced |
| erosion | wind or water carrying soil away |
| desalinization | removing salt from seawater |
| pesticides | chemicals that kill crop-destroying insects |
| acid rain | rain containing high amounts of chemical pollutants |
| conservation | careful use of resources so they are not wasted |
| savannas | broad grasslands with few trees |
| Mediterranean climate | areas with mild, rainy winters and hot, dry summers |
| humid continental climate | areas with long, cold snowy winters and short, very hot summers |
| marine west coast climate | climate of coastal area that get wind from the ocean |
| rain forests | dense forests in the tropics |
| faults | cracks in the earth's surface |
| core | the center part of the earth |
| plate tectonics | a theory about the earth's structure |
| core | the center part of the earth |
| source | point at which a river originates |
