1. Components of Earth

2. Biotic and Abiotic Factors

3. Spaceship Earth
Closed System
Resources are limited

4. Why is earth so favorable for life?
Distance from the sun (Temp range)
Size of the planet (Gravity)

5. What sustains life on earth?
Earth’s 4 spheres help support organisms
Atmosphere
Hydrosphere
Geosphere
Biosphere

6. Atmosphere
Hydrosphere
Geosphere
Biosphere

7. Biosphere
Abiotic and Biotic Factors
Uppermost part of the geosphere, most of the hydrosphere, and lower part of the atmosphere

8. Why it matters….. Humans are apart of a community of organisms
Humans are dependent on healthy ecosystems
Humans can disrupt ecosystems harming the organisms and themselves

9. Ecosystems (Sun) One – way flow of high – quality from the sun
Energy is lost as heat through process
Warms atmosphere
Evaporates and recycles water
Generates winds
Supports plant growth

10. What is an ecosystem?
An ecosystem includes a community of organisms and their physical environment.
Web of relationships
Predator/prey
Symbiotic
Competition
Biotic and Abiotic factors

11. Habitat Biodiversity Food, shelter, water, space
Variety of organisms in a given area
Abiotic factors
When biodiversity decreases in an ecosystem, health of the ecosystem decreases.

12. Impact Populations Limiting factors Resources Law of tolerance
too much or too little of abiotic factor
Nutrients, precipitation, temperature

13. Biological Components
Producers (Autotroph)
Make their own food
Consumers (Heterotroph)
Feed on other organisms
Omnivores
Carnivores
Herbivores
Detritivores

14. Food Chain VS Food Web

15. Food Chain VS Food Web Food Chain Food Web
Producer to herbivore to carnivore
Omnivore
Food Web
Interconnected food chains
Complicated
Loss of energy/10% Rule

16. Energy Flow in Ecosystems
Trophic levels
Each step in the transfer of energy in an ecosystem
Primary source, Sun
Producer
Consumer
Decomposer

17. Feeding levels Trophic levels
Producers are the lowest level
Primary consumers
Secondary consumer
Tertiary consumer and so on
10% rule, 90% energy lost as heat, growth, reproduction

18. Energy Pyramid
Demonstrates the amount of energy transferred to each level
10% Rule