atmosphere
biosphere
hydrosphere
geosphere
crust
mantle
core
volcano
earthquake
magnitude
lithosphere
asthenosphere
mesosphere(Geos.)
inner core
outer core
troposphere
stratosphere
mesosphere(Atmos.)
thermosphere
ozone layer
tectonic plates
mountains
Erosion
Nitrogen
radiation
conduction
convection
greenhouse effect
convection current
adaptation
evaporation
condensation
precipitation
salinity
water cycle
deep current
surface current
fresh water
ground water
the tragedy of the commons
industrial revolution
hunter gatherers
agricultural revolution
Agriculture
biodegradable
nondegradable
renewable resources
nonrenewable resources
ecological footprint
developing country
developed country