| A | B |
|---|
| acid rain | Type of pollution caused by chemicals from burning coal, oil and gas mix with rainfall. |
| anthracite | hard coal |
| bituminous | soft coal |
| cement | Fine gray powder mixed with water and small stones, sand, and gravel to make concrete. |
| consumer | A person who uses good and services. |
| currency | money |
| emigrants | One who leaves one's country or region and settles in another |
| exports | Goods ands services we send to other countries. |
| ford | To find the best and shallowest location when needed to cross a river or stream |
| fossil fuels | Resources formed millions of years ago from the remains of plants and animals under the earth's crust. |
| Frontier | Part of a country which faces another country or an unsettled region. |
| human resources | Utilizing the talents of the state's population |
| hydroelectric power | Force of water falling over a dam used to turn a turbine, or engiine, at a power plant which creates electricity. |
| immigrants | Someone who has emigrated to a new place. |
| imports | Goods and services we bring into our country or state. |
| industry | The production and sale of a good or service for profit. |
| international | Between or among nations. |
| interstate | Relating to the mutual relations of states. |
| iron ore | A natural resource from which iron is made |
| kerosene | A thin oil produced from petroleum used as a feul |
| locks | An enclosure used in raiding or lowering boats from level to level. |
| non-renewable | Something that cannot be extended or replaced. |
| pioneers | Early settlers in a territory |
| pollution | Being contaminated with harmful substances |
| reservoirs | An artifical lake where water is stored and collected for a water supply. |
| suburbs | Communities near the immediate area of a large city. |
| tax | Money that is collected to help pay for services provided by the government |
| wetlands | Lowland area, such as a marshy or swampy place, that holds moisture. |
| Pennsylvania's western rivers | Allegheny, Ohio, Monongahela, and youghiogheny |
| Pennsylvani's central rivers | Susquehanna, West Branch, and Juniata |
| Pennsylvania's eastern rivers | Delaware, Lehigh, Schuylkill |
