| A | B |
|---|
| zone of aeration | portion of ground water where water passes until it reaches the water table |
| zone of convergence | region of low pressure |
| zone of divergence | region of high pressure |
| zone of saturation | portion of ground with an upper boundary called the water table |
| troposphere | lower level of the atmosphere where all weather happens |
| stratsosphere | region of atmosphere above the troposphere and below the mesosphere |
| mesosphere | area of atmosphere above the stratosphere |
| thermosphere | area of atmosphere above the mesosphere |
| tropopause | boundary between the troposphere and the stratosphere |
| hydrosphere | thin layer of water which covers the majority of the Earth |
| lithosphere | continuous outer solid rock shell of the Earth |
| Prime Meridian | zero degrees latitude passing through Greenwich, England |
| International Date Line | imaginary line through the Pacific, to the east of which , the calendar date is one day earlier than to the west. |
