Unit 5 Lesson 1 What Is the Water Cycle? · 05/03/2018 · Unit 5 Lesson 1 What Is the Water...

Unit 5 Lesson 1 What Is the Water Cycle?

Copyright © Houghton Mifflin Harcourt Publishing Company


Water on the Move warm up 1



Water on the Move


• About three-fourths of Earth’s surface is covered by water.


Water on the Move


Video!!!


Water on the Move


• Water moves between Earth’s surface and

the atmosphere through a process called the water cycle.

• The sun provides the energy needed for water

to move through the water cycle.


Water on the Move



Water on the Move


• Evaporation is the change from a liquid to a gas. • Sunlight heats up water particles near the ocean’s

surface, causing water to evaporate.

• When water evaporates, it forms an invisible gas called water vapor.


Water on the Move


.


Water on the Move


Water can also evaporate from plant leaves through a process called transpiration.


Water on the Move


• The atmosphere is the mixture of gases that surrounds Earth.

• Water vapor rises into the atmosphere. In the

atmosphere, water vapor cools to form clouds.


Water on the Move



What Goes Up Comes Down


• As water vapor rises into the atmosphere, it cools. When water vapor loses enough energy, it condenses to form liquid water.

• Condensation is the change of a gas into a

liquid.

• Water vapor condenses around tiny particles of salt and dust in the atmosphere to form water droplets.




• When billions of droplets are close together, they form clouds.

• Clouds can contain liquid water, ice crystals or both.




• Clouds can form high in the sky or just above the

ground in the form of fog.




• As water droplets and snow crystals grow inside clouds, they become too heavy and fall to Earth as precipitation.

• Precipitation is water that falls from clouds to Earth’s surface.

• Rain, snow, and hail are all forms of precipitation.





Where Does Water Go?


• Precipitation that falls into the oceans may quickly evaporate back into the atmosphere.




• Precipitation that falls on land may be temporarily stored, it may flow across the land, or it may be used by living things.

• Depending on where it falls, water from

precipitation may move quickly or slowly through the water cycle.







• How does precipitation get into the ground to become groundwater?




• When precipitation occurs, much of the water will not reenter the atmosphere right away.

• Some water will seep into the ground. • Water that is stored underground is called

groundwater. Groundwater can be found near the surface or very deep underground.




• Runoff is water that cannot soak into the ground and instead flows across Earth’s surface.

• Too much precipitation may cause runoff, which

flows into streams, rivers, and lakes.

• Runoff may also flood low-lying areas.


Where Does Water Go? Warm up 3





• Precipitation that falls in cold places may become part of a glacier. A glacier is a large, slow-moving mass of ice.




• Water can be stored in glaciers for a very long

time. Eventually, glaciers will met.

• Melting glaciers can increase the amount of runoff in a place.




• Describe what is happening in the diagram.



A Precious Resource warm up 4



A Precious Resource

• Fresh water can come from rivers, lakes, and aquifers.

• An aquifer is a body of rock that stores

groundwater. Aquifers are huge, underground water reservoirs.



A Precious Resource

• The water in an aquifer can run low or be polluted

by human activities.

• Precipitation adds water to aquifers in places called recharge areas.

Unit 5 Lesson 1 What Is the Water Cycle? · 05/03/2018 · Unit 5 Lesson 1 What Is the Water...

Documents

Transcript of Unit 5 Lesson 1 What Is the Water Cycle? · 05/03/2018 · Unit 5 Lesson 1 What Is the Water...