Dynamic Planet/Earth's Fresh Water

=Earths Fresh Water= Earths Fresh water is centered on Rivers Lakes and Groundwater.

Freshwater is chemically defined as containing a concentration of less than two parts per thousand (<0.2%) of dissolved salts (salts that are in solution). Although water is abundant on the surface of Earth, freshwater is a very limited resource. Freshwater makes up less than 3% of the world water supply. Freshwater exists as lakes, which represent about 0.01% of the global water supply, rivers (0.0001%), atmospheric water including vapor, clouds, and precipitation (0.001%), shallow groundwater in soil and subterranean aquifers (0.3%), and polar icecaps and glaciers (about 2%). Some freshwater is unavailable for everyday use, including waters that are saline (salty), atmospheric water, and water frozen in icecaps and glaciers. In reality, less than 0.5% of Earth's freshwater is available for use by humans and other creatures. Pollution, waste, population growth, and competition over available resources further restrict the availability of freshwater. The availability of freshwater is likely to become more of a problem in the future. Most of the dissolved, inorganic chemicals in freshwater occur as ions. The most important of the positively charged ions (or cations) in typical freshwaters are calcium (Ca2+), magnesium (Mg2+), sodium (Na+), ammonium (NH4+), and hydrogen (H+). The most important of the negatively charged ions (or anions) are sulfate (SO42+), chloride (Cl-), and nitrate (NO3-). Other ions are also present, but in relatively small concentrations. Some freshwaters can have large concentrations of dissolved organic compounds, known as humic substances. These can stain the water a deep-brown, in contrast to the transparent color of most freshwaters.

Hydrological Cycle
There is a common steady cycle of water throughout the Earth. The best way

to know it is to follow the Image Below.



More Info
The water cycle is composed of 16 major steps. The easyest place to start is the oceans. The Sun which imparts energy in

the form of heat to the water causes evaporation of water vapor into the

air. Once the vapor is in the air through Evaporation, Sublimation(solid

directly to gas), or Transpiration(plants release vapor) it rises ad

condenses into clouds. Clouds grow and release water as precipitation

Precipitation can fall as Snow and accumulate in ice caps or glaciers or

melt and flow overland which is termed Snow melt. it can also fall as Rain

and flow as surface runoff or infiltrate into to ground and become

groundwater where in turn it can replenish aquifers. Eventually it will

reenter the ocean or water cycle.

Evaporation
More Info

Stream Drainage
Streams follow a general pattern based on topography. Drainage Channels

form where runoff can cutts into the ground.

Dendritic Drainage
Dendritic Drainage is the most common and looks similar to a tree.

Dendritic Drainage occurs where a region is above a single type of

bedrock (homogeneous). Which gives the entire area a similar resistance to

erosion and therefore a seemingly random placement of tributaries. Most

tributaries will join a larger stream at an acute angle.

Parallel Drainage
Parallel Drainage generally form where there is a large hill.They develop

in areas with parallel regions of rock that are harder to erode.

Trellis Drainage
Trellis Drainage Patterns form where there is a folded topography like the

Appalachian mountains. tributaries enter the main Stream at near right

angles.