| A | B |
|---|
| a community of all the living things in an area and the environment in which they live | ecosystem |
| a series of plants and animals, each of which depends on the one below it for food. | food chains. |
| the feeding relationships within an ecosystem. Each living thing in this provides food energy to other living things within that ecosystem. | food web. |
| made up of water that is not salty | freshwater |
| a large masses of ice found near Earth’s poles (continental) or in a high, cold mountain valley (alpine) | glaciers |
| the natural environment in which a plant or animal lives | habitat |
| nonnative plants and animals that invade an ecosystem | invasive species |
| damage to the natural environment caused by harmful substances that does not come from a single location, but rather from many sources such as runoff from farms | non-point-source pollution |
| damage to the natural environment caused by water from a single place, such as a discharge pipe at a plant that treats sewage | point-source pollution |
| something that damages, air, soil, or water | pollutants |
| damage to the natural environment caused by harmful substances; also refers to harmful substances | pollution |
| water from rainfall that is not absorbed into the soil and instead flows into streams or lakes | Runoff |
| bits of soil left in a place by moving water | sediment |
| a chemical that is poisonous to humans or other living things | toxic chemicals |
| a geographic area that includes all of the land and waterways that drain into a body of water. Sometimes it is also called a drainage basin. | watershed |
| an area where the soil is usually covered with water | wetlands |
