backup
stage
chemicals
generate
significant
feature
rocket
source
fascinating
overcome
someone or something that provides what is wanted or needed
extremely interesting or charming
a jet engine that is driven by gases produced by a burning substance
to produce (something) or cause (something) to be produced
a person or thing that can be used to replace or support another person or thing
an interesting or important part, quality, ability, etc.
large enough to be noticed or have an effect
to defeat (someone or something)
of or relating to chemistry
a particular point or period in the growth or development of something
