The Nutrient Cycles.

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Presentation transcript:

The Nutrient Cycles

The Carbon Cycle

The Carbon Cycle Carbon EXISTS in an abiotic environment as: 1. Carbon dioxide [CO2 (gas)] in the atmosphere 2. Carbonate rocks (limestone & coral = CaCO3) 3. Deposits of coal, petroleum, and natural gas  derived from once living things Carbon ENTERS a biotic environment through: 1. Photosynthesis: changes light energy to chemical energy 2. Dead organic matter

The Carbon Cycle Carbon RETURNS to atmosphere by: 1. Respiration  CO2 2. Decomposition / Decay 3. Burning BrainPOP - Carbon Cycle

The Nitrogen Cycle

The Nitrogen Cycle Nitrogen fixation * 80% of air is N2 gas * Nitrogen is essential to plants and animals * Plants and animals can’t use N2 gas * Usable N: ammonia (NH3) or nitrate (NO3) Nitrogen fixation 1. Aquatic ecosystems: blue-green algae 2. Terrestrial ecosystems: bacteria on roots of legumes (peas, beans, clover, peanuts)

The Nitrogen Cycle Nitrogen RETURNS to soil by: 1. decomposition of once living things  bacteria + fungi 2. exists in soil as nitrate and ammonia Nitrogen RETURNS to atmosphere by: 1. denitrifying bacteria BrainPOP - Nitrogen Cycle