Solid and liquid.
P u s s & B o o b
P and B
The two main types of rockets are, Solid Fuel and Liquid Fuel
The answer, is that there are only two types of rockets which fuel modern spacecraft. they are solid fuel rockets, and liquid fuel rockets
LIQUID PROPELLENTS OR SOLID PROPELLANTS
Only two: solid liquid fuel
what are the two main types of environment
there are two main types the marine and freshwater
Smaller alkanes and alkenes
The two main types of economy are Command and Traditional.
The two main types of friction are kinetic and static.
the two main types of communications are emailing and socialising
The two main types of friction are kinetic and static.
what are the two main types of environment