​atmosphere

the layer of gas surrounding a planet that is is held in a place by gravity

biosphere​

the sum of all living matter on earth​

​cryosphere

the places on earth where the water is frozen all the time

geosphere​

​portion of the system of earth that includes earth´s interior, rocks and minerals, landforms, and the process that shape earth´s surface

hydrosphere​

all the water on earth´s surface​; includes all water sources above and below the surface