Download ecology - nutrient cycles

The Water Cycle
There are two ways water gets back into the
atmosphere—from ________ and _______.
In the water cycle, plants release water back
into the atmosphere. This part of the water
cycle is called ________________.
The Carbon Cycle
In the carbon dioxide cycle, carbon dioxide is
returned to the atmosphere primarily by the
activity of _______________.
The Carbon Cycle
In the carbon cycle, most carbon dioxide
is removed from the atmosphere by what
process?
The Greenhouse effect is increasing on Earth
because increasing __________ __________
traps more heat.
The NITROGEN CYCLE
In the nitrogen cycle, what type of organism is
most responsible for keeping the cycle going?
In the nitrogen cycle, What is the role of bacteria
that live on the roots of plants? They change
__________ into ________ in a process called…
When an organism dies, the nitrogen in its
body is released by the action of bacteria
that act as _____________.
The phosphorous cycle is the only cycle in
which the chemical does not enter the
________________________.
When an ecosystem is limited by
a single nutrient that either is
scarce or cycles very slowly, this
substance is called a ________
When an ecosystem is limi ted by a single nutrient that either is scarce or cycles very
slowly, this substance is called a ______________________________.
Human Impact
Some pollutants
cycle through
organisms and build
up to thousands of
times more
concentration high
up on the food chain.