How do people disturb the balance

1
How do people disturb the balance?

• Chapter 4, Lesson 4
• Pages 124-129

2
People and the Environment

• Humans get food, shelter, and water from the land

• Humans can change the environment to meet their
  needs

• Changes can upset the balance of
  ecosystemsbuilding houses

3

• Products we make and use affect the ecosystem

• Waste from these products can pollute the air and
  water

• When chemicals hurt plants, animals can lose food
  and shelter

4

• Wastes, chemicals, and oil can get into rivers,
  lakes, and oceans and pollutes the water

• Some chemicals are used on land that will
  eventually make its way to water

5
Land Pollution

• Garbage can pollute land

• Hazardous waste are pollutants that can be
  dangerous to animals and humans and hurt nearby
  habitats

6
Stripping Away the Land

• Coal is mined by digging large holes in the soil

• Loose soil and rock can be washed away into ponds
  and rivers affecting nearby ecosystems

7
Land Reclamation

• Mining companies must now replace whatever is
  taken away
• Rocks and soil
• Trees and grass

• This helps animals return to their habitats and
  crops to be planted

8
Preserving the Environment

• The United States started National Parks to
  protect natures beauty and habitats of plants
  and animals

• Yellowstone was the first national park in the
  world

9
Multimedia

• Yellowstone National Park