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Chapter 2 (4-6)
Chapter 2 Lesson 4-6
| Term | Definition |
|---|---|
| Air mass- | A huge body of air that has similar temperature, humidity, and air pressure at any given height. |
| Tropical- | A warm air mass that forms in the tropics and has low air pressure. |
| Polar- | A cold air mass that forms north latitude or south of 50 degrees south latitude and has high pressure. |
| Maritime – | A humid air mass that forms over oceans. |
| Continental- | A dry air mass that forms over land. |
| Jet stream- | Bands of high speed winds about 10 kilometers above Earth’s surface. |
| Front- | The boundary where unlike air masses meet but do not mix. |
| Occluded- | Cut off, as in a front where a warm air mass is caught between two cooler air masses. |
| Cyclone- | A swirling center of low air pressure. |
| Anticyclone- | A high-pressure center of dry air. |
| Storm- | A violent disturbance in the atmosphere. |
| Thunderstorm- | A small storm often accompanied by heavy precipitation and frequent thunder and lightning. |
| Lightning- | A sudden spark, or energy discharge, caused when electrical charges jump between parts of a cloud, between nearby clouds, or between a cloud and the ground. |
| Hurricane- | A tropical storm that has winds of about 119 kilometers per hour or higher. |
| Storm Surge- | A “dome” of weather that sweeps across the coast where a hurricane lands. |
| Tornado- | A rapidly spinning column of air that reaches down and touches Earth’s surface. |
| Evacuate- | Moving away temporarily from an area about to be affected by severe weather. |
| Meteorologist- | Scientists who study the causes of weather and try to predict it. |
| Isobar- | A line on a weather map that joins places that have the same air pressure. |
| Isotherm- | A line on a weather map that joins places that have the same temperature. |
Created by:
rowlandm
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