Front

What are the four most important materials needed by living organisms?

Back

water, carbon, nitrogen, phosphorous

Front

This is essential to living organisms, it is found in nucleic acid and amino acids (proteins).

Back

Nitrogen

Front

The conversion of ammonium to nitrate is called what?

Back

nitrification

Front

The conversion of nitrate to nitrogen gas is called what?

Back

denitrification

Front

What is it called when water vapor cools and changes into a liquid? Options: condensation, respiration, precipitation, evaporation

Back

condensation

Front

The three steps of the water cycle include: condensation, precipitation, filtration, irrigation, evaporation.

Back

precipitation, condensation, evaporation

Front

Which of these is the greatest cause of harmful levels of carbon in the atmosphere? Options: respiration, combustion, photosynthesis, decomposition

Back

combustion

Front

What cycle is shown in the diagram?

Back

The Water Cycle

Front

Why do plants and animals need nitrogen?

Back

To produce proteins

Front

_________ is water clumping around dust particles to form clouds in the water cycle.

Back

condensation