| atlas |
a book of maps, tables, or charts. |
| brutal |
cruel or savage. |
| community |
a particular area where a group of people live. |
| constant |
going on without a pause; persistent. |
| develop |
to bring out the potential of; advance to a more complete or more effective condition. |
| echo |
the repeating of a sound caused by the bouncing of sound waves from a surface. |
| hoist |
to lift or haul up using a mechanical device. |
| hydrant |
an upright pipe with a valve from which water can be drawn from a water main. |
| lag |
to fall behind an expected pace. |
| rally |
to unite again or raise the spirits of after a disappointment or failure. |
| sample |
to test a part of something. |
| sensor |
a device that detects and responds to certain changes in the environment, such as light, temperature, sound, or pressure. |
| surface |
the outside limit or top layer of something. |
| weaken |
to make weak or weaker; to cause (something) to be less strong. |
| welfare |
a state of health, happiness, and good fortune. |