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Ecosystem Recycling
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Biogeochemical Cycle Biogeochemical cycle – water and minerals (carbon, nitrogen, and phosphorous) are recycled and reused
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Water Cycle Most of life’s chemical reactions occur in aqueous environments Key processes in water cycle are evaporation, transpiration, and precipitation
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Carbon Cycle Photosynthesis and cellular respiration are the two main steps in the carbon cycle Carbon dioxide is used to make sugars and break down sugars
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Human Influences on Carbon Cycle
CO2 in atmosphere has risen nearly 30% in the last 150 years Humans release CO2 by burning fossil fuels CO2 is released by decay of organisms
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Nitrogen Cycle Nitrogen-fixing bacteria are important in nitrogen cycle They change nitrogen gas into usable form of nitrogen for plants
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Phosphorous Cycle Phosphorous moves from phosphate deposited in rock, to the soil, to living organisms, and finally to the ocean Phosphorous is needed to make DNA, RNA, and Proteins
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Biomes Biomes – large terrestrial ecosystems that contain smaller ecosystems within
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Tundra Cold and largely treeless biome and characterized by permafrost
Plants: Grass, sedges, conifers, etc. Animals: Caribou, Snowy Owls, bear, etc.
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Deciduous Forests Characterized by trees that loose their leaves in fall Plants: Maple trees, oak trees, grasses, wild flowers, etc. Animals: Deer, rabbits, foxes, etc.
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Temperate Grasslands Low rainfall and dominated by grasses (A.K.A. prairie) Plants: Grasses and some trees Animals: Grazing animals (bison, moose, etc.)
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Other Deserts = low rainfall Savannas = tropical grasslands (Africa)
Rain Forests = abundant rainfall
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