Notes on Biosphere, Ecosystems, and Biomes
Physical Science and Ecosystems Overview
- General Concepts
- This section will cover major themes in physical science, the biosphere, ecosystems, and biomes.
Biosphere
- Definition: The biosphere is the sum of all living organisms on Earth and the environments in which they inhabit.
- Components:
- Living organisms (plants, animals, microorganisms)
- The interactions among these organisms and their physical surroundings.
Ecosystem
- Definition: An ecosystem encompasses a community of living organisms interacting with their physical environment.
- Key Characteristics:
- Includes all the biological (living) and abiotic (non-living) factors in an area.
- Comprised of various habitats, biotic communities, and environmental variables.
Atmosphere
- Definition: The atmosphere is a layer of gases that surrounds the Earth, essential for life.
- Structure:
- Composed primarily of nitrogen (approximately 78%) and oxygen (approximately 21%), with traces of other gases.
- Role:
- Provides necessary gases for respiration, influences weather patterns, and protects life from harmful solar radiation.
Lithosphere
- Definition: The lithosphere consists of the upper layers of the Earth, including the crust and the rigid upper mantle.
- Functions:
- Provides solid ground for terrestrial life and contains minerals and resources essential for human activity.
Hydrosphere
- Definition: The hydrosphere includes all of Earth’s water in all forms (liquid, solid, vapor).
- Components:
- Oceans, rivers, lakes, groundwater, and atmospheric moisture.
- Importance:
- Essential for sustaining life, facilitating biochemical processes, and regulating climate.
Biomes
- Definition: A biome is a large geographic biotic unit, a major community of plants and animals with similar life forms and environmental conditions.
- Types of Biomes:
- Examples include tundra, desert, rainforest, grassland, and aquatic.
- Factors Influencing Biomes:
- Climate, geography, and available water resources.