Earth

1
Earths Changing Surface

• presented by Robbie Higdon
• Winter/Spring 2003
• Adventure of the American Mind project

2
Earths Changing Surface

• The earths surface is built up by constructive
  forces
• The earths surface is torn down by destructive
  forces

3
Constructive Forces

• Deposition of sediments
• Creation of soils

Used by permission from Library of
Congress/American Memory Collection
4
Destructive Forces

• Weatheringthe process that breaks down rock
• Erosionmovement of weathered rock and soil from
  one place to another

Used by permission from the Library of
Congress/American Memory Collection
5
Effect on Humans

• Natural forces have had an effect on how humans
  interact with the Earths surface
• Which, in turn, have led to the conservation and
  destruction of the environment

6
What is Conservation?

• Using resources from the environment as long as
  those resources are not being destroyed
• Managing the Earths resources for the future,
  not just for today

7
Used by permission from Library of
Congress/American Memory Collection
8
Tradition of Waste

• Beginning in the mid to late 19th century,
  natural resources were being heavily exploited
• Clear cutting of forests
• Overgrazing
• Improper mining practices
• Click here for more information
• http//memory.loc.gov/ammem/ndlpedu/features/timel
  ine/progress/conserve/conserve.html

9
Early Conservationists

• Two early figures in the conservation movement
• John Muir founded the Sierra Club in 1892
• President Theodore Roosevelt established the
  first National Wildlife Refuge in 1903

Used by permission of the Library of
Congress/American Memory Collection
10
Todays Environmental Issues

• Overuse of resources
• Human population growth
• Pollution of the soil, air, and water
• Loss of habitat and species

Click here
http//soundamerica.com/sounds/themes/Schoolhouse_
Rock/