| A | B |
|---|
| aftershock | 余震， An earhquake follows the main earthquake |
| air mass | 具备相同温度和湿度的空气团; a body of air with the same temperature and moisture |
| air pressure | 气压; the weight of air |
| ash | 火山灰, very small material from a volcano |
| atmosphere | 大气层，气氛; gases that surrounds the earth |
| climate | 气候; weather over a long period of time |
| body wave | 在地层深处传导的地震波; earthquake wave that travels through the body of the earth. |
| caldera | 又大又深的圆形火山口; a large, deep round hole on top of a volcano |
| cinder cone | 小的圆锥形火山（低于400米). Small cone-shaped volcano; smallest of 3 types |
| composite volcano | 底部很大， 近山顶很陡的火山（粘稠的岩浆和碎石反复喷发形成）Volcano formed from sticky lava and broken rocks |
| shield volcano | 平缓坡度的火山; 最大的火山（岩浆流动形成). Broadly sloping volcano formed from fast flowing lava; largest volcanoes. |
| barometer | 气压计; We use this tool to find changes in air pressure. |
