Science: Unit 4.5 How Do Environmental Changes Affect Living

Science: Unit 4.5 How Do Environmental Changes Affect Living

Ways Environment Changes

• Natural Changes by weather: erosion, drought, flood, fires

• Natural Changes by animals: beavers cut down trees to make dams, termites build tall mounds

• People: use resources and build

Flooding

• a large amount of water that covers normally dry land

• can happen suddenly

• 
  

Drought

• when it does not rain for a long time

• long droughts force people and animals to look for new places to live

• plants wilt and die

Erosion

• when small pieces of rock are carried away by water and sometimes by wind

• as erosion happens, habitats for plants, animals, and people disappear

• tiny rocks and sand move in a flowing river

Ways We Can Help

• don't pollute water

• clean up litter

• recycle

• plant trees

• limit air pollution

Multiple Choice

What most likely caused this ecosystem change?

• drought

• erosion

• fire

• flood

Multiple Choice

What causes a drought?

• moving water

• no rainfall

• too much rainfall

• warm weather

Multiple Choice

Which is an example of how people can help an environment?

• a pond is drained

• trees are planted in a forest

• trash is dumped in the ocean

• houses are build on a grassland