into Direction: Read each question carefully and encircle the letter of your choice 1. What is the carbon cycle? a. The continuous changing of nitrogen gas into compound is the soil and later released back the air b. Precipitation that flows over the land's surface into rivers and lakes and is not absorb1ed into the ground c. The continuous exchange of carbon among living things. d.The constant movement of water as a liquid and a gas between Earth's air and its surface. 2. What is the nitrogen cycle? a. The continuous changing of nitrogen gas into compounds in the soil and later released back into the air. b.Continuous exchange of carbon among living things. c. The changing of a liquid into a gas. d. The change of gas into a liquid as the gas cools. 3. What energy is needed for the changes in the water cycle to occur? a.wind b. nitrogen cycle c. electric d. sun 4. A mixture of decayed plant and animal material that ca be used as fertilizer. a.runoff b. compost c. groundwater d. evaporation 5. The changing of a gas into a liquid as the gas cools. a.runoff b. compost C. condensation d. evaporation
