environmental
air humidity
aqua
aquifer
artesian
clay
cloud
condensation
cool
creviced
cross
cut
cycle
diagram
drilling
earth
ecology
education
environment
evapotranspiration
extraction
flow
geologic
geological
geology
gravel
ground
groundwater
illustration
lake
land surface
landscape
limestone
natural
nature
ocean
permeable rock
precipitation
pump
rain
river
rock
sand
sandstone
saturated zone
schematic
science
section
soil
stone
transpiration
tree
underground
unsaturated zone
vegetation
water
well