1. A rocket burns a fuel that makes a great deal of gas at the back of the rocket. P. Ordinary fuel will burn only in air, because it needs the oxygen in the air. Q. A rocket can therefore travel outside the atmosphere in space where there is no air. R. This gas pushes against the rocket and sends it forward. S. However, rocket fuels have their oxygen in them and so they burn without air. 6. In fact, it will travel faster in space than in the air because the friction of the air is not there to slow it down.

1. A rocket burns a fuel that makes a great deal of gas at the back of

1.	1. A rocket burns a fuel that makes a great deal of gas at the back of the rocket. P. Ordinary fuel will burn only in air, because it needs the oxygen in the air. Q. A rocket can therefore travel outside the atmosphere in space where there is no air. R. This gas pushes against the rocket and sends it forward. S. However, rocket fuels have their oxygen in them and so they burn without air. 6. In fact, it will travel faster in space than in the air because the friction of the air is not there to slow it down.
A.	QSRP
B.	RPSQ
C.	SQPR
D.	PRQS
Answer» C. SQPR

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