Ch. 4 Cycles in Ecosystems Lesson 1 By: Naeema, Imani, Trey, Mahri, Romello

Water Cycle First, a body of water goes through evaporation. Next, water droplets gather with water dust particles and form clouds through condensation. Then, water falls from the atmosphere as precipitation. Finally, water will flow into river then into oceans. After this step, the water cycle will start over. Some water will settle underground and become groundwater.

What is the Water Cycle? Water cycle= the continuous movement of water between Earth’s surface and the air, changing from liquid into gas into liquid again Evaporation= the changing of a liquid into gas Condensation= the changing of gas into a liquid Precipitation=any form of water that falls from the atmosphere and reaches the ground Watershed= the area from which water is drained

Runoff= the precipitation that flows across land’s surface and does not absorb will then flow into rivers then into the ocean Groundwater= water that settled underground. Groundwater is stored in holes and pores in the soil. It is also stored in rocks. Plants and animals play a role in the water cycle.

Nitrogen Cycle? First, nitrogen is changed into a form that organisms can use. Next, the nitrogen is fixed by lightning, volcanic activity, or by certain bacteria. Then, nitrogen-fixing bacteria turns nitrogen gas into ammonia. After that ,ammonia is changed into a form of nitrogen that can be used for plants called nitrite After, plants grow they absorb a second type of soil called nitrate. Now, animals take in nitrogen when they eat plant or herbivores. Soon after,animals use the nitrogen to form compounds excrete to make waste.

What is the nitrogen cycle? Nitrogen is another key element for all organisms. The protein that make up muscles, skin, nerves, bones, blood and enzymes in your body contain nitrogen Ammonia= a nitrogen containing substance Nitrite=the first type of soil bacteria to turn ammonia into a nitrogen containing substance Nitrate= another substance that contains nitrogen Denitrification= the process of changes nitrates goes through by changing back into gas in the soil

8. Finally, nitrogen gas and nitrate returns back to the atmosphere through the process of denitrification.

How is Matter Recycled? Renewable resources=the resources that can be reused Nonrenewable resources=the resources that cannot be replaced We can conserve natural resources by recycling them. Compost=a mixture of dead organic material that can be used as fertilizer Composting is a way to recycle. One product of the decomposition is an nitrogen-containing substance ammonia. Compost replenishes the nitrogen used by plants as they grow.

What is carbon cycle? Carbon is important element in every living thing Carbon in the atmosphere is plentiful as carbon dioxide gas Carbon cycle=the continuous exchange of carbon among living things during cellular respiration both animals plants burn carbon rich foods Over a long period of time and under extreme pressure from the layers of earth above, it may be turned into a fossil fuel

Carbon Cycle Plants and other photosynthic organisms take in carbon dioxide from the air They combine it with water to make sugars and other chemicals enter Carbon rich chemicals are then eaten directly by herbivores and indirectly by carnivores The end product of cellular respiration- carbon dioxide –then returns to the atmosphere 5.Decomposers break down dead or decaying plants and animals 6.This break down releases some additional carbon dioxide into the earth 7. The carbon and fossil fuel is released into the atmosphere