That's up to you because you have to go through the book to see their expressions
<span> If electricity and magnetism can create motion, can the reverse be true? Can motion and magnetism create electricity?</span>
A boiling pot of water (the water travels in a current throughout the pot), a hot air balloon (hot air rises, making the balloon rise) , and cup of a steaming, hot liquid (hot air rises, creating steam) are all situations where convection occurs.
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Answer
a) For the rock
b) 
for maximum range
c) The value of θ is the same on every planet as g divides out.
