Oxygen
Cycle
Cycle
During this step, plants create and release oxygen through the process of photosynthesis.
What is the 1st step of the Oxygen Cycle?
During this step, most nitrates are absorbed by the plants.
What is assimilation?
Once the plants absorb CO2, they go through this process.
What is photosynthesis?
This provides the energy for the Water Cycle.
What is the sun?
The percentage of air that is made up of nitrogen.
What is 78%?
During this step, animals breathe out CO2.
What is the 3rd step of the Oxygen Cycle?
During this step, nitrogen in the atmosphere is converted into ammonia.
What is nitrogen fixation?
These are the 3 most common ways in which CO2 can get into the atmosphere.
What is respiration, decomposition and the burning of fossil fuels? (combustion is also acceptable as one)
Clouds are formed during this stage of the Water Cycle.
What is condensation?
The percentage of air that is made up of oxygen.
What is 21%?
During this step, animals breathe in the oxygen.
What is the 2nd step of the Oxygen Cycle?
This is the form of nitrogen that can be used by most living things.
What are nitrates?
During the aquatic carbon cycle, these are the plant-like organisms that absorb CO2.
What are microscopic algae?
The process in which water is changed from liquid to gas (vapor).
What is evaporation?
The percentage of air that is made up of carbon.
What is 0.04%?
"making fire"
What is combustion?
To convert nitrogen into a form that can be used by living things.
What is the goal of the Nitrogen Cycle?
These are formed when the carbon molecules that are not released back into the atmosphere are buried underneath the ground for centuries.
What are fossil fuels?
The evaporation of excess water from plants and land surfaces.
What is evapotranspiration?
The percentage of the earth that is covered by water.
What is 70%?
Respiration, Combustion, and Decomposition
What are the 3 processes that use up oxygen?
These are the bacteria that do all of the work during the ammonification step.
What are decomposers?
These are the 3 things needed by plants for photosynthesis.
What are CO2, sunlight and water?
These are the 6 steps of the water cycle in order from first to last. (you cannot look at your notes!)
What is evaporation, condensation, precipitation, infiltration, run-off, and accumulation?
The percentage of water on earth that humans cannot use, because it's salt water.
What is 97%?