What causes a nuclear fission chain reaction to continue?
A - the energy that results from the previous fission reaction
B - thermal energy added to the system from the surroundings
C - thermal energy released from the system to the surroundings
D - the neutrons that result from the previous fission reaction

D

Explanation:

The emission of several neutrons in the fission process leads to the possibility of a chain reaction if at least one of the fission neutrons induces fission in another fissile nucleus, which in turn fissions and emits neutrons to continue the chain.

I hope this is right LOL

it takes on an electronical energy

colorless gas, exhibiting a blue glow when placed in an electric field

b) solid

its a type of rock