Sources of Freshwater

welcome to moomoomath and science and
sources of fresh water the earth has an abundance of water and even appears blue
from space however only a small percentage of the water on earth is
fresh water and much of this fresh water is either frozen or unattainable here’s
a quick recap of the Earth’s water after looking at the chart you’ll notice that
fresh water only makes up roughly 3% of all the water on earth you’ll find the
bulk of this fresh water in these four main sources surface waters which
include lakes rivers streams ponds swamps and marshes glaciers and ice caps
groundwater shallow and deep and the atmosphere surface waters can be simply
described as the water that is on the surface of the earth
although surface waters are important they only make up less than one percent
of fresh water these surface waters include rivers streams lakes swamps and
marshes rivers and streams make up the flowing
surface water the force of gravity naturally draws water from a higher
altitude to a lower altitude rivers obtain their water from two sources
groundwater and running when flowing water travels to an area of land that is
completely surrounded by higher land a lake or a pond is formed the water is
not trapped in this lower area water just escapes at a slower rate than the
rate of incoming water lakes can vary greatly most lakes are freshwater swamps
and marshes form in a similar manner glacier and ice caps are referred to as
the storehouses of freshwater they store roughly 70% of the world’s fresh water
and cover 10% of the world’s land mass these glaciers are primarily located in
Greenland and Antarctica the glaciers in Greenland almost covered the entire land
mouth groundwater is defined as water that is found beneath the surface of the
earth groundwater accounts for roughly 30 percent of freshwater on earth it is
about 60 times as plentiful as the freshwater found in lakes and streams
water in the ground travels through pores in soil and rock and in fractures
in weathered areas of bedrock the amount of pore space present in a rock and soil
is known as porosity the ability to travel through the rock or soil is known
as permeability groundwater can be found in aquifers an aquifer is a body of
water saturated sediment or rock in which water can move through readily
aquifers may occur at various depths the closer to the surface or more likely to
be used for water supply and irrigation there are two main types of aquifers
unconfined and confined and unconfined aquifer is partially or fully filled
aquifer that is exposed to the surface of the wing
in contrast a confined aquifer is an aquifer that has a confining layer that
separates it from the land source they are usually found deep in groundwater
the atmosphere is another source of fresh water the atmosphere contributes a
very small percentage of the total fresh water on earth about 90% of the water in
the atmosphere is produced by evaporation from water bodies while the
other 10% comes from the transpiration from plants there is always water in the
atmosphere clouds of course the most visible portions of the atmosphere hold
water but even clear air contains some water which is in particles that are too
small to be seen if you’d like to know more about the water on earth this
playlist will help and as always thanks for watching
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