| A | B |
|---|
| solar system | sun, 9 planets and all other objects that revolve around the sun |
| planets | sypherical object that orbits around a star |
| satellite | body that orbits around a larger object |
| rotation | 24 hours; act or turning on an axis; 1 complete spin |
| revolution | 1 year; orbit of object in space; earth around the sun |
| tropics | warm area in low latitudes |
| polar regions | cold area near north or south pole |
| solstice | dec. 21 june 21; 1 or 2 times each year when the earths polar axis points at or away from the sun at greatest angle |
| tropic of capricorn | line of lat. located 23 1/2 degrees south of equatorand it's struck by the most direct rays of light |
| antarctic circle | dec. 21-day-24 hours june 21-dark-24 hours; 66 1/2 degrees south of equator |
| arctic circle | dec. 21-dark-24 hours june 21-light-24 hours; 66 1/2 degrees north of equator |
| tropic of cancer | 23 1/2 degrees north of equator; june 21-more direct sunlight |
| equinox | 1 or 2 times each year when earth's polar axis is not pointing towards or away from the sun but it's at a 90 degree angle; 12 hr. light and 12 hr. darkness |
| earth system | interaction of elements on or around earth |
| atmosphere | gases in air |
| lithosphere | solid surface of the earth that forms the continents and ocean floors |
| hydropshere | all water on earth; physical system made up of all earth's water |
| biosphere | part of earth in which all plants and animals exist |
