| A | B |
|---|
| seasons | spring, summer, fall, winter |
| thermometer | used to measure temperature |
| temperature | how hot or cold something is |
| equator | imaginary line around the center of the earth |
| axis | imaginary line from North Pole to South Pole on which the earth tilts |
| polar | regions of the earth that are always cold |
| tropics | regions of the earth near the equator that are always hot |
| temperate | regions of the earth that have 4 seasons |
| weather | how hot or cold, cloudy or sunny, windy, rainy or dry it is on a certain day |
| water vapor | water in the air in the form of gas |
| expand | get larger |
| contract | get smaller |
| condensation | water vapor changing back to liquid |
| humidity | amount of water vapor in the air |
| clouds | formed when water vapor condenses high up in the air |
| dew | form of condensation we see outdoors on summer mornings |
| cirrus | feathery clouds very high in sky |
| frost | condensation in form of ice crystals we see outdoors on winter mornings |
| stratus | gray blanket of clouds |
| precipitation | water falling from clouds back to earth |
| cumulus | fluffy white clouds |
| rain | most common kind of precipitation in summer |
| nimbostratus | clouds that bring stormy weather |
| snow | precipitation in form of ice crystals |
| evaporation | liquid water changing to water vapor |
| water cycle | all water on earth moving from ground to air and back over and over again |
| storage | water in lakes, ponds, rivers, oceans |
| sleet | frozen rain |
| rain gauge | used to measure the amount of precipitation |
| hail | ice balls that can fall as precipitation in summer |
| Celsius | a scale for measuring temperature most often used by scientists |
| Fahrenheit | a scale for measuring temperature that we most commonly use |
