Some people obtain their water from underground layers of rock or sediment called _________.
aquifers
A large powerful warm surface current in the Atlantic Ocean that affects the climate of land in its path is the ____.
gulf stream
most of Earth's fresh water is in the form of ___.
ice
Tha main way that wind erodes the land is by the process of __.
deflation
Over many years, the levels of nutrients in a lake build up the process of ___.
eutrophication
the best type of soil in wich to grow plants is called __.
loam
A type of plowing known as ___ helps conserve soil by disturbing it as little as possible.
conservation plowing
Deep currents are caused by differences in ___ of ocean water.
density
Reptiles were so sucessful during the __ era that this time is often called the age of reptiles.
Mesozoic
Wind and water are agents of ___ that move sediment from one location to another.
erosion
The main ways sediment enters a river are mass movement and __.
runoff
In the great plains, __ removed grass and exposed the soil to wind erosion.
plowing
Liquid water can change to water vapor through boiling or __.
evaporation
Some people have suggested towing ____ from Antarctica to supply fresh water to dry areas of the world.
icebergs
One agricultural pollutant that increases the growth of algae in a lake is a ____.
fertilizer
One way that waves shape a beach is to break up rock and carry it away in a process called ____.
erosion