| A | B |
| ANGLE OF INSOLATION | angle from horizon to sun position |
| EL NINO | warm Pacific Ocean water changes weather patterns |
| GREENHOUSE EFFECT | gasses trap heat like glass does |
| OZONE | absorbs ultraviolet radiation |
| CARBON DIOXIDE & WATER VAPOR | absorb infrared (heat) radiation |
| INSOLATION | INcoming SOLar radiATION |
| SUNSPOTS | dark areas on Sun (11-yr cycles) |
| TRANSPIRATION | water evaporated from plants |
| GLOBAL WARMING | increase in world's temp. over past 100 years |
| SEASONS | caused by Earth's 23 1/2 degree tilt |