Unit 2: Earth Science
Chapter 4: Earth's Water
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Lesson 1: Earth The Blue Planet
Lesson Summary: Students must know most of Earth's water is present as salty water int he oceans, which cover most of the Earth's surface. Almost three-fourths of the Earth's surface is covered by water. Most of the water on Earth is salt water. Flowing water, waves ounding on shores, and volcanoes under the ocean's surface add salt to the ocean. Most of the Earth's fresh water is frozen in ice sheets. |
Vocabulary
Resources Text link to Earth: The Blue Planet Study Jams Water Cycle |
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Lesson 2: The Water Cycle
Lesson Summary: Liquid water can evaporate and turn into water vapor. Water vapor in the air can form clouds, fog, rain, hail, sleet, or snow. Condensation occurs when a gas changes into a liquid. Evaporation occurs when water changes from a liquid to a gas. Precipitation falls as rain, sleet, hail or snow. Water changes form and moves from place to place in the water cycle. (p. 198) |
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Lesson 3: Freshwater Resources
Lesson Summary: There is only so much fresh water on Earth. To keep the supply of fresh water available to people, fresh water must be stored and recycled. Usable fresh water comes from running water, standing water, and groundwater. Fresh water from rain runs through watersheds. Plants, buildings, and roads all affect this flow. Fresh water can become polluted by human activities. It is protected by government laws and cleaned in water treatment plants. |
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Lesson 4: California's Water Supply
Lesson Summary: The fresh water you use comes either from running water, standing water, or ground water. Most of California’s precipitation falls in the north. A system of aqueducts, reservoirs, and dams helps to supply dry areas of California with water. Water conservation can help Californians meet their needs for fresh water |