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Cards In This Set
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Chesapeake Bay was the world's largest ______________.
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Oyster fishery.
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_____________, _________, and ____________ ruined the chesapeake bay.
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Overharvesting, pollution, and habitat destruction
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What is a system?
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A network of relationships among components that interact with and influence one another.
Ex: Human body- respiratory sy. interacts with nerves sy., etc.
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What is a feedback loop?
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A circular process in which a system's output serves as input to that same system.
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What is a negative feedback loop?
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Output resulting from a system moving in one direction acts as an input that moves the system in the other direction.
-stabilizes the system.
Ex: If we get hot, we sweat and cool down.
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What is a positive feedback loop?
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Instead of stablilizing a system, if drives it further toward an extreme.
-rare in nature.
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Lithosphere
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Rock and sediment
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Atmosphere
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The air surrounding the planet
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Hydrosphere
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All water on Earth
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Biosphere
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The planet's living (biotic) organisms
-plus the abiotic (nonliving) parts they interact with
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Watershed
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The land area that drains water into the river
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Phytoplankton
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Microscopic algae and bacteria
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Eutrophication
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-Nutrient overenrichment, blooms of algae, increased production of organic matter, and ecosystem degradation.
-Nitrogen and phosphorus enter the watershed causing phytoplankton to grow, then bacteria eat dead phytoplankton and wastes and deplete oxygen, causing fish and other aquatic organisms to flee or suffocate.
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Hypoxic zone
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Dead zone, with little to no oxygen, that occurs when eutrophication takes place.
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More than _____ hypoxic dead zones.
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400
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