| A | B |
|---|
| photoperiod | the amount of day light from sunrise to sunset |
| rotation | the earth rotates on its axis once every 24 hours giving us day and night |
| revolution | the earth revolves around the sun one every 365 days, giving us a year with four seasons. |
| military time | telling time using all 24 hours- na am or pm |
| equator | An imaginary line that divides the earth into the northern hemisphere and the southern hemisphere |
| daily cycle | 24 hours- day and night |
| axis | the imaginary line which goes through the north and south poles and around which Earth spins |
| solstice | This happens twice a year when the earth is tilted either towards or away from the sun |
| equinox | This happens twice a year, the earth is not tilted towards or away from the sun so we have equal parts of day light and darkness. |
| North and South Poles | the the two points on the earth where the imaginary line, called the axis, emerges |
| Eastern Hemisphere | The eastern half of the earth. It is located east of the Prime Meridian. |
| Western Hemisphere | The western half of the earth. It is located west of the Prime Meridian. |
| lines of latitude | the lines that run left to right on the globe or map |
| lines of longitude | The lines that run from the top to bottom on the glover or map |
| Universal Time (UT) | Greenwich Mean Time (GMT) |
| reason for the seasons | the earths tilt |
| Northern Hemisphere | The half of the earth above (north) of the equator |
| Southern Hemisphere | the half of the earth below (south) of the equator |
| coordinates | numbers (latitude and longitude) that are used to locate a point on a map or globe |
| degree | the basic unit for measurement on a map or globe |
| Prime Meridian | The line dividing west from east (it passes through Greenwich, England!) |
| north | the direction above the equator |
| south | the direction below the equator |
