Which sort of change is combustion?
a. Chemical
b. Physical
c. Endothermic
d. Hypergolic
Answer: a. Chemical
Environmental & Atmospheric Sciences
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The reason that the Moon takes on a crescent shape each month has to do with the
A) Earth's shadow. B) Sun's position. C) both of these D) neither of these
Environmental & Atmospheric Sciences
What is the difference between synfuels and synthesis gas? What will be an ideal response?
Environmental & Atmospheric Sciences
Oil sand does not contain ____.
A. bitumen B. water C. clay D. coal E. sand
Environmental & Atmospheric Sciences
The head of a stream generally has a higher gradient than the mouth of a stream.
a. true b. false
Environmental & Atmospheric Sciences