Answer:
is the symbol for an oxide ion
0.0015 kilometers is for sure the answer!
Since we're talking about a chain reaction, I think this would be a) self-sustaining. Chain reactions are not usually described as "weak" and can be highly explosive depending upon the compounds (think Uranium!).
The first (artificial) self-sustaining nuclear reaction is attributed to Enrico Fermi in 1942. Here's a bit of history:
http://www.atomicarchive.com/History/firstpile/firstpile_01.shtml
Answer:
water stored in a dam
Explanation:
when the water is in dam it is ready to move bit is not moving
