The element itself is Yttrium, which is a transition metal and not that reactive. Since it has 39 protons it will also have 39 electrons.
Answer
Rapid Combustion
Explanation:
An explosion is a combustion and a quick reaction, That makes it rapid
C should be the answer to the following formula
Most definitely gravity. Gravity is what makes things go up and or down
Climate change or it could just be Climate,
Hopefully that helps ❤