1.
a series of events following on quickly from each other, each of which causes the next one
2.
a self-sustaining nuclear reaction in which each fission of an atomic nucleus causes neutrons and energy to be emitted, each collision of neutrons with other nuclei causing a further fission
3.
a series of chemical reactions in which the product from one reaction helps to create the next one
4.
a series of events that happen very fast, with each event causing the next one
1.
a series of events following on quickly from each other, each of which causes the next one
2.
a self-sustaining nuclear reaction in which each fission of an atomic nucleus causes neutrons and energy to be emitted, each collision of neutrons with other nuclei causing a further fission
3.
a series of chemical reactions in which the product from one reaction helps to create the next one
4.
a series of events that happen very fast, with each event causing the next one