Chapter 3 Environmental Systems

Which sphere are humans a part of?

• geosphere

• hydrosphere

• biosphere

• atmosphere

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A change in state in which water returns to Earth's surface and changes from a vapor to a liquid is called 

• condensation

• transpiration

• evaporation

• recharge

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Matter that organisms require for their life processes are called

• legumes

• decomposers

• fertilizers

• nutrients

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What products are created by the process of photosynthesis?

• the sun's light and energy

• oxygen and carbohydrates

• phosphorus and nitrogen

• carbon dioxide and water

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Water molecules are composed of

• two oxygen atoms and two hydrogen atoms.

• one oxygen atom and two hydrogen atoms.

• two oxygen atoms and one hydrogen atom.

• one oxygen atom and one hydrogen atom.

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What function does carbon dioxide play in Earth’s atmosphere?

• It provides gas for humans to breathe.

• It provides a high level of protection from the sun’s radiation.

• It keeps Earth warm through the greenhouse effect.

• d. It provides liquids for animals to drink.    

Water which returns from the atmosphere to Earth’s surface as rain or snow is called

• evaporation

• transpiration

• condensation

• precipitation

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Nutrients circulate endlessly throughout the environment in complex cycles called

• eutrophication cycles

• respiration cycles

• photosynthesis cycles

• biogeochemical cycles

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What is the term for organisms, including plants and algae, that create their own food?

• consumers

• producers

• legumes

• decmposers

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In extreme cases, eutrophication can lead to extremely low levels of oxygen in a body of water as decomposers break down all the dead producers, a condition called

• hypoxia

• nitrogen fixation

• respiration

• photosynthesis

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