Geology(地理)

Atmosphere 大气层
atom 原子,sphere 球体

crust 地壳

mantle 地幔

inner core
outer core
cross section

tropic of Capricon/南回归线
tropic of Cancer/北回归线

equator/赤道

latitude/longitude 纬度/经度

sphere 半球, southern hemisphere

Arctic circle/North pole