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Unit 3 –The Water CycleLesson 1
California State Standards3.a – Students know most of Earth’s water is present as
salt water in the oceans, which cover most of Earth’s surface.
3.b – Students know when liquid water evaporates, it turns into water vapor in the air and can reappear as liquid when cooled or as a solid if cooled below the freezing point of water.
3.c – Students know water vapor in the air moves from one place to another and can form fog or clouds, which are tiny droplets of water or ice, and can fall to Earth as rain, hail, sleet or snow.
McWay Falls, CA
Where did the water in the waterfall come from?
Where does water in rivers come from and where does it go?
How is the water in the waterfall different from ocean water?
Input water cycle- the constant movement of
water from Earth’s surface to the atmosphere and back to Earth’s surface.
water vapor – the gas form of water.
Input evaporation – the process by which a liquid
changes into a gas.condensation – the process by which a gas
changes into a liquid.
The Water Planet Pg. 226-227
Input - The Water PlanetWater covers almost three-fourths of Earth’s
surface and 97% of it is found in the oceans.Ocean water is salty.
Saltwater can also be found in some lakes.
Input - The Water PlanetThe rest of the Earth’s water is fresh water
(less than 3%).
Most of the fresh water on Earth is frozen in ice caps and glaciers.
Input - The Water PlanetMost of the remaining fresh water can be
found underground.Underground water is the only source of fresh
water for many people around the world.
The Water Cycle Pg. 228-229
Input - The Water CycleWater moves constantly throughout the
environment.
The water cycle is also known as the hydrologic cycle.
Earth’s surface
Air
Input - The Water CycleEnergy from the sun drives the water
cycle. The sun’s energy warms water on the Earth’s
surface. This causes some of the water to turn from a liquid
to a gas. The water vapor moves into the air.
When water vapor cools, it becomes a liquid again. Once it becomes heavy enough, it falls back to
Earth.
Input - The Water CycleWater may fall back into the ocean, lakes,
rivers, or onto the ground.When it falls on land, it can be soaked into the
ground, or run off the surface into rivers and lakes.
Some water can quickly recycle back to the atmosphere if the sun heats it and it it turns into water vapor again.
The Water CycleMost rainwater comes from the oceans.
When water from the oceans turns into water vapor, all of the salt that had dissolved in the water stays in the ocean. When the water vapor cools, fresh water forms and
falls to Earth.
The Water CyclePg. 230 Evaporation
Input - EvaporationWater evaporates because heat changes it
from a liquid to a gas, also called water vapor.
It is hard to see evaporation because water vapor is invisible.
Input - EvaporationA large amount of water evaporates from
Earth’s oceans, lakes, and rivers every day.As water evaporates, is goes up into the air
and mixes with other gases.
The Water CycleCondensation Pg. 231
Input - CondensationWhen water vapor becomes part of the air, it
moves with the air.Air can carry water vapor very long distances
and high into the atmosphere.
Changes in the air temperature affect the water vapor.As air and water vapor move up, they cool,
when they get cold enough, condensation occurs.
Input - CondensationAir has dust particles in it. When water vapor
condenses, it changes into a liquid on the dust particles. The water vapor and dust form clouds and fog.
Input CondensationFog is a cloud that forms near the ground.Clouds stay in the air because the water
droplets are tiny.As additional condensation happens, it causes
the water droplets to increase in size they then fall to Earth as rain.
Water may also fall to Earth as snow, sleet, or hail if the air is cold enough for water to freeze.
Lesson 2 Language of the Discipline
Input Watershed – The area of land in which water
runs off into a particular system of creeks and rivers.
Dam – A barrier across a river that controls the river’s flow.
Reservoir – A body of water stored for future use.
Aqueduct – A pipe or channel that is used to transport water.
Ground water – Water that is in soil and rocks below Earth’s surface.
Unit 3 - How can People Conserve Water?
Lesson 3 Pg. 250-257
Standard5.3.d – Students know that the amount of
fresh water located in rivers, lakes, underground sources, and glaciers is limited and that its availability can be extended by recycling and decreasing the use of water.
Input Pollution – Any change to a resource that
makes the resource unhealthful to use. Water quality – How safe water is for use by
humans, animals, and plants. Conservation – The preserving and protecting
of a resource. Reclamation – The recycling of used water.
Water Pollution Pg. 254-255
Input We need clean water to live but our water is
often polluted with harmful substances.Some substances come from factories and
mines that dump waste into rivers and lakes. Sewage (human waste) can get into the water
supply as well. The runoff from farms and city streets affects
the quality of surface water.
Water ConservationPg. 256-257
Input Water resources are limited, because of this
it is very important to conserve our water. Especially in California with our drought and
long periods with little rain. The population is growing. This means we
have more people who need water but less water to give.
To provide we are starting to recycle water and decrease the amount of water used.
Dirty water is treated in water treatment facilities.
Ways to ConserveWatering plants in the morning saves water
because smaller amounts of water evaporate in the cool morning.
Turn water off when brushing your teeth.Plant trees or shrubs that require little water
to survive.Use the dishwasher and washing machine
ONLY when full.Taking quick showers.
SummaryWrite your own!
You can do it!
Unanswered QuestionsHow can you tell the difference between fog
and clouds? Write your own 2 questions – you must have 3
written questions total.
Across the disciplinesYou are a writer for the OPA Daily
newspaper. Please write a one paragraph article telling us something exciting about the water cycle. Maybe a new way to conserve water was discovered, or they just discovered a new water source. Make it interesting and full of facts!
ModelingWhat is pollution?
Any change to a resource that makes the resource unhealthful to use.
What do you call the preserving and protection of a resource?Conservation
Check for understandingWhat is another name for the water cycle?
Hydrologic cycle
Check for understandingWhere is most of earth’s water?
The oceans