Name: _________________________________________Date: ______________Group: ______Period: _____
The Cycling of Materials Keystone Webquest
BIO.B.4.2.3 Describe how matter recycles through an ecosystem (i.e., water cycle, carbon cycle, oxygen cycle, and nitrogen cycle).
When scientists talk about cycles, they are talking about sequences of events that repeat themselves. In the
ecosystem, cycles can be very complex. There are many different types of elements and nutrients that must
cycle for the ecosystem may function properly. These elements cannot be made or destroyed, but they can
change their location. In this way, elements cycle through ecosystems. These cycles are called
biogeochemical cycles. This webquest examines three of those cycles: water, carbon, and nitrogen.
Go to: http://www.windows2universe.org/earth/Water/water_cycle.html
Label the steps of the WATER
CYCLE here:
1. What are 3 states of matter water goes through
during the water cycle?
2. How does water vapor get into the atmosphere?
3. What occurs during transpiration?
4. What occurs during condensation?
5. Where does the water that infiltrates (seeps) into
the ground end up?
Go to: http://www.windows2universe.org/earth/Water/co2_cycle.html
Label the steps of the CARBON
CYCLE here:
* THE CARBON CYCLE MAY BE CALLED THE OXYGEN CYCLE ON THE KEYSTONE!!**
Go to: http://online.wvu.edu/Faculty/demo/Module_2/carbon_cycle_animation.html
1. Click on the arrow button to advance through the animation.
2. Answer the following questions as you proceed through the animation.
1. How much carbon dioxide is in the atmosphere?
2. What are the top 3 gases that make up the
majority of the atmosphere?
3. What happens to carbon dioxide during
photosynthesis?
4. How do organisms other than plants get their
carbon?
5. During respiration, what happens to carbon
dioxide?
6. What are two examples of decomposers? What
happens to carbon dioxide during decomposition?
7. What role does the ocean play in the carbon
cycle?
8. What are the three fossil fuels?
9. What happens to carbon dioxide when fossil
fuels (or any materials) are burned?
Go to: http://www.windows2universe.org/earth/Life/nitrogen_cycle.html
Label the steps of the NITROGEN
CYCLE here:
Go to http://studyjams.scholastic.com/studyjams/jams/science/ecosystems/nitrogen-cycle.htm
1. Click “Play Video”
2. When finished, click “Close” in the upper right hand corner
My nitrogen cycle quiz
3. Click on “Test Yourself”
4. Take the quiz, and record your score in the box to the right.
score was ____/ 7.
5. Review your answers, and record the correct answers below.
1. What is the nitrogen cycle?
2. How do humans (or any
animals) get nitrogen?
3. Which of the following
comes first in the process of
nitrification?
4. How do nitrates turn back
into nitrogen gas?
5. Which of the following is
one of the key components of
the nitrogen cycle?
6. What do plants and animals
use nitrates for?
7. How are people upsetting the
nitrogen cycle?