Transcript 4_ 0303hydrologic cycle

FL#4 The
Hydrologic (Water)
Cycle
EcologyStandard 6D
•The Earth's water is always in circulation.
•It has been recycled for the last 3 billion
years.
•This process is called the water cycle.
Water is constantly being cycled
through our environment, from the
oceans to the atmosphere to the land
and back to the oceans. Hence
“cycle”.
Air is an important part of the water cycle.
The hotter air is, the more water it
holds. Hot air also rises. As air travels
up the troposphere it is cooled and can
no longer hold as much water and we
get condensation. As air rises through the
troposphere (first 6-8 miles) the temp can drop from 17 to
-54 degrees Celsius. This cooling causes condensation.
Leeward
Hot Air Rises
Temp in the troposphere
can go from 62 to –125 oF.
Windward
Air Temp drops as air is
forced over mountains.
Desert 128 oF
At Night
Precipitation
Condensation
Review
Condensation
Transpiration
Precipatation
Surface Runoff
Condensation
Evaporation
Subsurface Runoff
Accumulation
Water changes from
liquid to gas via the
process of
EVAPORATION.
Water can also enter the
atmosphere as a gas via the
process of TRANSPIRATION.
This is when evaporation from
the leaves of plants occurs.
Once water enters the
atmosphere as water
vapor,
CONDENSATION
(gas to liquid) can
occur to form clouds.
PRECIPITATION (
gas to liquid (rainfall,
snow, etc.) can then
occur.
When precipitation falls on the land it flows into
streams, rivers, lakes, and groundwater. It is also
absorbed by the roots of plants. Most water
eventually ends up as RUN-OFF into the oceans
or evaporating back into the atmosphere to
continue the cycle over and over again.
1. What is the correct order of the
water cycle?
A. evaporation, precipitation,
condensation, run-off
B. evaporation, condensation,
precipitation, run-off
C. evaporation, run-off,
condensation, precipitation
D. none of these
2. Transpiration is…
A. evaporation from lakes and
rivers.
B. formation of water droplets in
clouds.
C. evaporation from the leaves of
plants.
D. the absorption of water by the
roots of plants.
3. Water changing from gas to
liquid is called…
A. evaporation
B. condensation
C. precipitation
D. both b & c
E. none of these
4. In the Water Cycle, which
step
immediately follows
condensation?
A.Evaporation
B.Transpiration
C.Precipitation
D.Accumulation
5. What is this
diagram
showing?
Water Cycle