| A | B |
|---|
| Continental Divide | an imaginary line that runs north and south along the peaks of the Rocky Mountains |
| lava | melted rock |
| timberline | a line on a mountain slope, above it is too cold for trees to grow |
| public land | land that is owned by the government |
| hydroelectricity | electricity produced by water power |
| ecosystem | a community of living things in a natural area and its environment |
| consumer | a person who buys a product or service |
| microchip | a tiny electronic circuit |
| archipelago | a group of islands |
| Makah | a Pacific Coast Native American group |
| Chinook | Native American traders, invented a language |
| Sacajawea | N.A. helped Lewis and Clark |
| Yellowstone | first national park |
| Jeannette Rankin | first woman elected to Congress |
| satellites | improved communication |
| oil | main industry in Alaska |
| Asian Americans | largest ehtnic group in Hawaii |
