Modeling interconnected spheres
read the paragraph, and then complete the model fill in the blanks with the correct sphere names to model
fossil fuels are substances that can be burned to produce now sees are com
how spheres are connected when fossil fuels are
m emo
energy. the buming of fossil fuels releases certain gases dernie
into the air. these gases combine with other chemicals in
the air to form substances called acids. when trees on the
too of mountains are exposed to clouds that contain these
acids, the acids remove substances from the trees that
the trees fight against harmful insects

step 1 ammonium can be absorbed by plants, but some is converted into nitrates which are better for plants to absorb. this is called nitrification. 2. step 2 the deer eats the plants and uses the nitrogen-containing proteins for cell growth. 3. step 3 bacteria in the soil conduct nitrogen fixation to convert nitrogen gas from the atmosphere into ammonium. 4. step 4 some of the nitrates are absorbed back into plants, but denitrification breaks down the nitrates into nitrogen gas released back into the atmosphere. 5. step 5 nitrogen is found in the urine, which gets broken down into ammonium through the process of ammonification. 6. step 6 plants absorb the ammonium and begin assimilation, the process to add the nitrogen to protein.