Roughly 97.5% of earth’s water resides on the oceans and Is too salty to drink or to use to
2.5% is considered
, water that is relatively pure, with few dissolved
Some of which is tied up in glaciers, icecaps and underground aquifers,
just over 1 part in 10000 of earth’s water is easily accessible for human
Water is moving among reservoirs via the hydrological cycle
As it moves it redistributes heat, erodes mountain ranges, builds river deltas,
maintains organisms and ecosystems, shapes civilizations, and gives rise to
Rivers and streams wind through landscapes
Water from rain, snowmelt, or springs runs downhill and converges where the land dips
lowest, forming streams, creeks or brooks.
watercourses merge into rivers, which eventually lead to ocean.
A small river flowing into a larger one is a
The area of land drained by a river and all its tributaries is that river’s
Rivers shape the landscape through which they run.
The force of water gradually eats at the outer shore, eroding soil from the bank
Meanwhile, sediment is deposited along the inside of the bend, where
water currents are weaker.
Because of this, river bends become
exaggerated in shape
Eventually a bend may become such an extreme loop (
water erodes a short cut from one end of the loop to the other
creating a direct course. (
Areas nearest a rivers course that are flooded periodically are said to be within a rivers
Agriculture thrives in foodplains and
(river side) forests are productive and
Wetlands include marshes, swamps and bogs
are systems that combine elements of freshwater and dry land.
shallow water allows plants to grow above the waters surface.
also consist of shallow water rich in vegetation, but they occur in forested areas.
Also created when beavers build dams across streams with limbs from trees they
have cut, flooding wooden areas upstream.
are ponds thoroughly covered with thick floating mats of vegetation and can
represent a stage in aquatic succession.
Wetland are extremely valuable as habitat for wildlife & also provide important
ecosystem services by slowing runoff, reducing flooding, recharging aquifers, and
Lakes and ponds are ecologically diverse systems
The region ringing the edge of a water body is named the