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Unit 2: Earth Science

Chapter 4: Earth's Water

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 
  • ocean
  • fresh water
  • evaporation
  • water vapor
  • ice sheet
  • glacier

Resources
Text link to Earth: The Blue Planet
Study Jams Water Cycle 

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)

Vocabulary 
  • condensation
  • sea breeze
  • land breeze
  • fog
  • precipitation
  • water cycle

Resources
Textbook Link 

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.
Vocabulary 
  • reservoir
  • dam
  • groundwater
  • aquifer
  • watershed
  • flood
  • contaminate
  • pollute


Resources
Textbook Link 
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
Vocabulary 
  • drought
  • reclamation
  • aqueduct
  • conservation



Resources
Textbook Link 

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