1. Natural Disasters
7-4.3
Explain the interaction among changes in the environment due to natural hazards, changes in populations, and limiting factors

2. Factors that Change the Environment
Changes In
Population
Limiting
Factors
Natural
Hazards
All Lead to

3. Limiting Factors
Food
Water
Space
Shelter

4. Limiting Factor
Limiting Factor – any biotic(living/was living) or abiotic(non-living) factor that limits the # of individuals in a population

5. Changes in Population
Population Density – the amount of people living in a given amount of space

6. Immigration and Emigration
Births and Deaths
Births add to a population
Deaths decrease a population
Immigration and Emigration
+ “Immigration” means to move “in” to a
population
- Emigration “exits” the population

7. Carrying Capacity What does the word carry mean???
Example: I am carrying 5 books.
What does the word capacity mean????
Example: Clemson’s “Death Valley” Memorial Stadium’s seating capacity is 80,301.

8. Carrying Capacity The largest amount of individuals
of a species that an environment
can support and maintain for a
long period of time.

9. PACT Workbook Read pages 132-134 Answer ‘Before You Read’
Answer 1-3 in the Margins
Answer 1-3 on page 135
Page 37 (Blue Side)
Page 38
Page 39

10. Large areas of ground movement of rock & Earth
Landslide
Large areas of ground movement of rock & Earth

11. What are they caused by?…..
Rains
Floods
Earthquakes
Human causes
Excessive development
Clear cutting for lumber

12. Examples of Effects 4) Disrupting Power lines 3) Destroying Habitats
2) Damaging Homes
Blocking Roads

13. Wildfires What are they caused by?????? Lightning Strikes Humans
Natural event in grasslands and forests
Lightning Strikes
Humans

14. Examples of Effects ON THE BRIGHT SIDE . . . 3) Destroying Habitats
2) Destroying Homes
Increase Air Pollution

15. FLOODS 2 TYPES Regular River Floods Flash Floods
Deposition of sediment & Nutrients
Creation of fertile soil
Damage Property
Endanger humans & animals