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Unit 1 Lesson 2 The Water Cycle

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1 Unit 1 Lesson 2 The Water Cycle
Copyright © Houghton Mifflin Harcourt Publishing Company

2 What Goes Up … What is the water cycle?
Unit 1 Lesson 2 The Water Cycle What Goes Up … What is the water cycle? The movement of water between the atmosphere, land, ocean, and living things makes up the water (hydrologic) cycle. Rain, snow, and hail fall on the oceans and land. On land, ice and water flow downhill. Water vapor moves upward and is carried great distances by the wind. The wind also creates ocean currents. Copyright © Houghton Mifflin Harcourt Publishing Company 2

3 How does water change state?
Unit 1 Lesson 2 The Water Cycle How does water change state? Water on Earth is found as a liquid, solid, and gas. The water cycle is powered by energy from the sun. Water absorbs energy from its surroundings as it melts from solid to liquid. Water also absorbs energy as it evaporates from liquid to gas, or when it sublimates from solid to gas. Copyright © Houghton Mifflin Harcourt Publishing Company 3

4 How does water change state?
Unit 1 Lesson 2 The Water Cycle How does water change state? Water releases energy to its surroundings when it condenses from gas to liquid. Water also releases energy when it freezes from liquid to solid or deposits from gas to solid. No water is lost during these changes of state. Copyright © Houghton Mifflin Harcourt Publishing Company 4

5 How does water reach the atmosphere?
Unit 1 Lesson 2 The Water Cycle How does water reach the atmosphere? Water reaches the atmosphere as water vapor through evaporation, transpiration, and sublimation. Evaporation occurs when liquid water changes to water vapor. Most of the water vapor evaporates from Earth’s oceans. Copyright © Houghton Mifflin Harcourt Publishing Company 5

6 How does water reach the atmosphere?
Unit 1 Lesson 2 The Water Cycle How does water reach the atmosphere? Transpiration is the release of water vapor into the atmosphere by plants. Sublimation is when solid water changes directly to water vapor without first becoming a liquid. Sublimation can occur when dry air blows over ice or snow, where it is very cold and the pressure is low. Copyright © Houghton Mifflin Harcourt Publishing Company 6

7 How does water reach the atmosphere?
Unit 1 Lesson 2 The Water Cycle How does water reach the atmosphere? Identify each process as evaporation, sublimation, or transpiration. Copyright © Houghton Mifflin Harcourt Publishing Company 7

8 What happens to water in the atmosphere?
Unit 1 Lesson 2 The Water Cycle What happens to water in the atmosphere? Condensation is the change of state from gas to liquid. It can occur in the air as clouds, fog, or mist, or on the ground as dew. Precipitation is any form of water that falls to Earth from clouds. Rain, snow, and hail are common forms of precipitation. Copyright © Houghton Mifflin Harcourt Publishing Company 8

9 How does water move on land and in the oceans?
Unit 1 Lesson 2 The Water Cycle How does water move on land and in the oceans? Streams, rivers, and the water that flows over land are types of runoff. Runoff flows downhill. Some of the water on land seeps into the ground. This process is called infiltration. Once undergound, the water is called groundwater. Groundwater also flows downhill. Copyright © Houghton Mifflin Harcourt Publishing Company 9

10 Movement of Water

11 The Water (Hydrologic) Cycle

12 How does water move on land and in the oceans?
Unit 1 Lesson 2 The Water Cycle How does water move on land and in the oceans? Glaciers, which may be called “rivers of ice,” flow downhill and sometimes flow to the ocean, where pieces may break off. Winds move ocean water on the surface in great currents over long distances. Cold or salty water will sink in the ocean, forming deep ocean currents that move large amounts of water. Copyright © Houghton Mifflin Harcourt Publishing Company 12

13 Water Works What does the water cycle transport?
Unit 1 Lesson 2 The Water Cycle Water Works What does the water cycle transport? The water cycle moves energy and matter. Energy is transported by changes in state and by the movement of water from place to place. Matter is transported all around the world by ocean currents, rivers, and glaciers. Copyright © Houghton Mifflin Harcourt Publishing Company 13

14 What does the water cycle transport?
Unit 1 Lesson 2 The Water Cycle What does the water cycle transport? Identify the processes in the water cycle. Copyright © Houghton Mifflin Harcourt Publishing Company 14

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