| A | B |
|---|
| Forty-niner | A person who went to California in 1849 to search for gold. |
| Telegraph | A machine that used electricity to send messages over wires. |
| Transcontinental Railroad | A railroad that crosses an entire continent such as the one completed in 1869 linking the east and west coats of North America. |
| Labor | work |
| Fjord | A narrow inlet of the ocean between cliffs. |
| Earthquake | A sudden shaking of the ground caused by the movement and cracking of rock deep inside the Earth. |
| Volcano | An opening in Earth's surface out of which hot gases, ash, and lava may pour. |
| Lava | Hot, melted rock that comes from a volcano. |
| Crater | An opening in Earth's surface created when a volcano erupts and begins to throw out lava. |
