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Many types of ___ are used over and over again in the environment.
Matter
The way water and gases move through ecosystems and are used over and over is called a ___.
Cycle
Most of Earth’s water is in the ___.
Oceans
The path water follows as it moves from Earth through the ___ and back to Earth is called the water cycle.
Atmosphere
The three processes involved in the water cycle are evaporation, condensation, and ___.
Precipitation
Water changes from a liquid to a gas during the process of ___.
Evaporation
___ changes back into liquid water during condensation.
Water vapor
Rain, snow, sleet, and hail are examples of ___.
Precipitation
___ is an important element in proteins, which all organisms need to survive.
Nitrogen
Nitrogen in ___ is essential to passing on genetic information.
DNA
During the process of ___, nitrogen changes from a gas into a form that organisms can use.
Nitrogen fixation
___ in the soil and water fix nitrogen gas in compounds that organisms can use.
Bacteria
Some animals obtain the nitrogen they need when they eat ___ that have absorbed nitrogen compounds from the soil.
Plants
___ in the soil break down dead organisms and animal wastes. Thus, nitrogen returns to the soil.
Bacteria
The process that is the main source of oxygen in Earth’s atmosphere is ___.
Photosynthesis
The oxygen cycle involves the change from oxygen to ___ and back again.
Carbon dioxide
