4A Logan McNamara

2. dioxide, water, and
3. water contained in places such as lakes, ponds, rivers, streams, and reservoirs
5. the process in which water vapor is changed back into a liquid
6. when water in the atmosphere falls in the form of rain, sleet, snow, hail, or freezing rain
8. the water on or surrounding the surface of the globe, including the water of the oceans and the water in the atmosphere
13. the circulation of nitrogen and its compounds by living organisms in nature
14. The movement and exchange of carbon through living organisms, the ocean, the atmosphere, rocks and minerals, and other parts of the Earth
15. Water that flows across the land and enters rivers and streams
16. When animals take in oxygen and consume food and release carbon dioxide as a waste product
18. the ecosystem that includes all of earth's rock and layers of non-living things
19. this element is needed for plants and animals to make proteins, DNA, and amino acids

1. the layers of gases that surround the air
2. one of the things plants need for photosynthesis
4. the ecosystem comprising the entire earth and the living organisms that inhabit it
7. water found beneath Earth's surface
9. process in which water moves from the oceans to the air to the ground and finally back to the oceans
10. Fuel, such as wood, coal, or oil, burned to useful heat or power; fuels that are made of hardened remains or traces of animals or plants
11. the process in which water turns from a liquid to a gas
12. the process in which plants make food from
17. the most abundant supply of nitrogen