Spr Fill in the blanks with the correct sphere names to
model how spheres are connected when fossil fuels
are burned.
Read the paragraph, and then complete the model.
Fossil fuels are substances that can be burned to
produce energy. The burning of fossil fuels releases
certain gases into the air. These gases combine with
other chemicals in the air to form substances called
acids. When trees on the top of mountains are exposed to
clouds that contain these acids, the acids remove
substances from the trees that help the trees fight against
harmful insects
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