Question

please answer the following using the words in the text box. carbon cycle coal oil natural gas burning of fossil fuels volcanoes photosynthesis respiration ocean sugar greenhouse decayed 1. plants use co₂ in the process of ____________ to make __________ and oxygen. 2. animals use oxygen in the process of __________ and make more co₂. 3. the __________ is the main regulator of co₂ in the atmosphere because co₂ dissolves easily in it. 4. in the past, huge deposits of carbon were stored as dead plants and animals __________. 5. today these deposits are burned as fossil fuels, which include __________, __________, and __________. 6. more co₂ is released in the atmosphere today than in the past because of __________. 7. another natural source for co₂ is __________. 8. too much co₂ in the atmosphere may be responsible for the ____________ effect. 9. write the equation for photosynthesis. 10. draw a simple diagram of the carbon cycle using the words in the text box above.

Explanation:

1. Photosynthesis is the process by which plants use CO₂ to make sugar and oxygen.
2. Respiration is the process in which animals use oxygen and produce CO₂.
3. The ocean can dissolve CO₂, regulating its amount in the atmosphere.
4. Dead plants and animals decayed and stored carbon in the past.
5. Coal, oil, and natural gas are fossil - fuels.
6. Burning of fossil fuels releases more CO₂ into the atmosphere now.
7. Volcanoes are a natural source of CO₂.
8. Excess CO₂ may cause the greenhouse effect.
9. The equation for photosynthesis is 6CO₂ + 6H₂O $\xrightarrow{light\ energy\ and\ chlorophyll}$ C₆H₁₂O₆+ 6O₂.
10. A simple carbon - cycle diagram would show arrows between sources and sinks of carbon such as plants (photosynthesis), animals (respiration), ocean, fossil fuels (burning), volcanoes, and the greenhouse effect.

Answer:

1. Photosynthesis; sugar
2. Respiration
3. ocean
4. decayed
5. Coal; Oil; Natural Gas
6. burning of fossil fuels
7. volcanoes
8. Greenhouse
9. 6CO₂ + 6H₂O $\xrightarrow{light\ energy\ and\ chlorophyll}$ C₆H₁₂O₆+ 6O₂
10. (Diagram description: Start with plants taking in CO₂ for photosynthesis, producing sugar and oxygen. Animals take in oxygen for respiration and release CO₂. The ocean is shown as a regulator of CO₂. Fossil fuels like coal, oil, and natural gas are shown, with an arrow indicating burning of fossil fuels releasing CO₂. Volcanoes are shown as another source of CO₂ release. The greenhouse effect is shown as a result of excess CO₂ in the atmosphere. Arrows should connect these elements to show the flow of carbon in the cycle.)