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| Question | Answer |
| How can a renewable resource become a non-renewable resource? | If it is used carelessly. |
| What are two ways that water enters the atmosphere? | evaporation and transpiration |
| What are the two main processes involved in the Carbon and Oxygen Cycle? | photosynthesis and cellular respiration |
| What is the build-up of pollutants in the fatty tissues of aquatic organisms? | biomagnification |
| What happens between evaporation and precipitation? | condensation |
| What are two human activities that add carbon dioxide to the atmosphere? | combustion and mining |
| In the nitrogen cycle, how does nitrogen gas get put into the soil as ammonium? | nitrogen fixation |
| Which organism plays the biggest role in the nitrogen cycle? | bacteria |
| How is water removed from the atmosphere and returned to the earth? | precipitation |
| What is the amount of land necessary to produce and maintain enough food, water, shelter and waste? | ecological footprint |
| What are gases that keep the biosphere at a temperature that can support life? | Greenhouse gases |
| What is the a barrier that prevents an organism from accessing its entire home range that is caused by building of roads and harvesting of forests? | habitat fragmentation |
| What is an organism that was brought to an ecosystem and poses a threat to the stability of an organism because they prey on or crowd out a native species? | invasive species |
| What are resources that are used up faster than they can be replenished? | non-renewable resources |
| What is caused when pollutants in the air get into the water cycle and lower the pH of the precipitation? | acid rain |
| In the nitrogen cycle, how is ammonium converted into the usable form of nitrates? | nitrification |
| What gas is given off during photosynthesis and used during cellular respiration? | oxygen |
| What gas is given off during cellular respiration and used during photosynthesis? | carbon dioxide |
| In the nitrogen cycle, how are used nitrates in the soil returned to the atmosphere? | denitrification |
| What are the two possible outcomes of water once it is returned to the earth? | run-off and infiltration |
| in the nitrogen cycle, how is nitrogen in dead and decaying organisms returned to the soil as ammonium? | ammonification |
| In the nitrogen cycle, how are nitrates taken up into the roots of plants for protein production? | assimilation |