| A | B |
|---|
| geothermal | heat from beneath the earth's surface |
| irrigation | supplying land with water |
| hydroelectric power | electricity produced from flowing water |
| arid | very dry |
| fact | a statement that can be proven true |
| opinion | an idea or belief |
| national park | an area of land set aside by the federal government |
| specialization | a business practice of making only a few goods or offering one service in order to become expert at it |
| mission | a settlement for teaching religion to local people |
| wagon train | a line of horse and carriages used to carry people and all their belongings |
| transcontinental railroad | the first train system to link the east and west |
