1. Each of the following statements has an area/areas where you have a choice of words/phrases. You will choose the most correct word/phrase to fill in those places. Example: The (carbon; hydrologic; rock) cycle is responsible for the movement of Earth’s watery resources. 1. (NH 3 ; NO 2 ; NO 3 ) is the form of nitrogen most usable by plants.

2. 2. The process of (photosynthesis; cellular respiration; decomposition) is responsible for decreasing the amount of CO 2 in our atmosphere. 3.The largest sink for carbon is found in (oceanic zooplankton; marine and sedimentary rock formations; rainforests) all around the Earth. 4.Of the following processes, (transpiration; precipitation; infiltration) works against the force of gravity. 5.The only nutrient cycle that doesn’t have a true atmospheric component is the (carbon; sulfur; phosphorus) cycle.

3. 6. Oceans cover (97%; 87%; 71%) of the Earth’s surface. 7.The major reservoir of nitrogen on Earth is the (atmosphere; lithosphere; biosphere) 8.Inorganic nitrogen-containing ions are taken in by the plants and then converted into organic molecules such as amino acids, through (nitrification; ammonification; assimilation) 9.(Nitrogen fixation; denitrification; nitrification) can only be accomplished by lightning and bacteria.

4. 10. (Sea salt; volcanic ash; CO 2 ) cannot form a condensation nuclei, needed for a raindrop to manifest as a part of the hydrologic cycle. 11. When ammonia is released by organisms, either through waste, or through decomposition… (nitrification; denitrification; ammonification) occurs. 12. The (hydrosphere; cryosphere; atmosphere) consists of liquid water, ice, and water vapor. 13. 99% of the volume of air in the troposphere consists of O 2 and (H 2 ; CO 2 ; N 2 ).

5. 14. (Adding nutrient fertilizers and pesticides to agricultural areas; deforestation in rainforests; increased evaporation over tropical oceans) is one of the largest anthropogenic contributors to the increased levels of CO 2 in our atmosphere. 15. A change in the structure and chemistry of a rock as it is dragged down into the Earth is most indicative of (igneous; sedimentary; metamorphic) rocks. 16. One of the main contributors of atmospheric oxygen is (photosynthesis; cellular respiration; outgassing by volcanoes)

6. 17. When ammonia is a product of fixation by bacteria, it can either be incorporated directly into plants as is, or undergo (nitrification; denitrification; assimilation), changing it into NO 3 18.Dissolved droplet components of the (sulfur; rock; phosphorus) cycle contribute to the formation of acid rain and deposition, which along with other pollutants can damage the biosphere. 19.The carbon and oxygen cycles are most closely related through the processes of (fixation and denitrification; combustion and decomposition; photosynthesis and respiration)

7. 20. (N 2 ; O 2 ; CO 2 ) is a molecule that has a great potential to absorb thermal energy, which is why it is such an important molecule to consider when studying climate change. ***BONUS***5 points Describe ONE way that the hydrologic cycle interacts with or contributes to the carbon cycle, or rock cycle.