1. The Biosphere and Factors in Ecosystems
SNC1D
Introduction to biomes video

2. The Biosphere
Biosphere: the zone around Earth where life can exist within the lithosphere, atmosphere, and hydrosphere (You can have artificial biospheres!)

3. The Biosphere
It has 3 components that interact with each other:

4. The Atmosphere Atmosphere: the layer of gases surrounding Earth
Made up of:
78% nitrogen
21% oxygen
Remaining <1% is composed of argon, water vapour,
It acts like a blanket and moderates surface temperature (blocks solar radiation and UV light)
Three layers within the atmosphere: Troposphere, Stratosphere and Mesosphere

5. The Lithosphere
Lithosphere: Earth’s solid outer layer

6. The Hydrosphere
Hydrosphere: All of Earth’s water in solid, liquid and gas form (freshwater accounts for ~ 3% of all water on Earth)

7. Ecosystems
An ecosystem is all the living organisms and their physical and chemical environment Abiotic factors: components of the atmosphere, lithosphere, and hydrosphere (non-living components like wind, temperature) Biotic factors: all living things and their remains, and features, such as nests, associated with their activities
A marine ecosystem
A terrestrial ecosystem

8. Biotic factors
Community: all organisms living in the same ecosystem Population: all individuals of the same species in an ecosystem

9. Ecosystems
Ecosystems can be large (a forest) or small (a rotting log) Sustainable Ecosystem – an ecosystem that is maintained through natural processes (Humans often change the biotic and abiotic factors of an ecosystem)

10. Biomes Biome: a large area defined by its climate and plant life
Major ecosystems that spread over a large portion of the Earth and share similar abiotic and biotic factors