Scientific would be the word to fill in the blank
I did the test and the answer is C.
Answer: 1.Sulfuric acid is a catalyst
2. Vanadium(v) oxide is a catalyst
The sun
The heat source for our planet is the sun. Energy from the sun is transferred through space and through the earth's atmosphere to the earth's surface. Since this energy warms the earth's surface and atmosphere, some of it is or becomes heat energy.
Closer=Burn
Farther=Freeze
We are the perfect distance away from the sun for it to sustain life.