The Water Cycle
This is harmful to the environment and is produced by humans
What is acid rain
In this process, plants use CO2 to make sugar and oxygen
What is photosynthesis
This is not found in the free state of nature
What is phosphorus
Animal waste decays by the action of______
What is bacteria
This is limited in the oceans
What is Nitrogen
The main factor in the water cycle ( in periodic form/ ex. CO2)
What is H2O
In this process, animals use oxygen to make more CO2
What is respiration
Phosphorus is mostly contained in these two substances
What are rocks and minerals
This is a special bacteria that can directly use nitrogen from our atmosphere to “fix” it so other organisms can benefit
What are nitrogen-fixing bacteria
This is limiting in freshwater
What is phosphorus
Acid rain is harmful to plants and_____
what are animals
Burning these create more CO2 in the atmosphere
What are fossil fuels
Too much phosphorus can strangle other life forms in water by causing this
What is overgrowth
This makes up 78% of our atmosphere
What is nitrogen gas
This is the limit to productivity, with an ample amount of sun
What are nutrients
This plays a major role in the water cycle ( think the sky)
What is the atmosphere
This is a natural source for CO2 ( hint: eruptions )
What is a volcano
Phosphorus from soil can be washed away into this source
What is a water basin
Higher organisms use nitrogen to make this
What are proteins
This is lacking along with nitrogen, phosphoru, and potassium
What are micronutrients
Two main sources of water for the Water Cycle
What are the ocean and groundwater
The main regulator of CO2 in the atmosphere
What is the ocean
Phosphorus moves between soil and _____
What are plants
This bacteria can break down the ammonia into the gaseous form of nitrogen
What are denitrification bacteria
This helps replace for plants
What is fertilizer