1. 1) 2) 3) 4) 5) 6) The Carbon Cycle Carbon dioxide in the air Plants take in CO 2 for photosynthesis and release O 2. Organisms take in O 2 for cellular respiration and release CO 2. Animals and plants die and decompose, releasing carbon into the environment. Carbon is used to make coal, oil, and natural gas (fossil fuels). Fossil fuels are burned (combustion) and release CO 2 into the air. Click and drag descriptions into place

2. 1) 2) 3) 4) 5) 6) The Nitrogen Cycle Nitrogen gas is in the air. Click and drag descriptions into place Nitrogen fixation by lightning or bacteria changes gas into nitrogen in the soil. Plants take up nitrogen through their roots. Animals eat the plants and therefore take in nitrogen. Decomposers release nitrogen from dead plants and animals. Bacteria in the soil change nitrogen back to a gas.

3. 1) 2) 3) 4) 5) 6) The Carbon Cycle Carbon dioxide in the air Plants take in CO 2 for photosynthesis and release O 2. Organisms take in O 2 for cellular respiration and release CO 2. Animals and plants die and decompose, releasing carbon into the environment. Carbon is used to make coal, oil, and natural gas (fossil fuels). Fossil fuels are burned (combustion) and release CO 2 into the air. Click and drag descriptions into place

4. 1) 2) 3) 4) 5) 6) The Nitrogen Cycle Nitrogen gas is in the air. Click and drag descriptions into place Nitrogen fixation by lightning or bacteria changes gas into nitrogen in the soil. Plants take up nitrogen through their roots. Animals eat the plants and therefore take in nitrogen. Decomposers release nitrogen from dead plants and animals. Bacteria in the soil change nitrogen back to a gas.