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All elements are either solid, liquid or a ______ .
gas
The part of a spacecraft in which people travel.
capsule
Children have these on special occasions. You blow them up and hang them for decoration.
balloon
A power which causes an object to move or change the way that it moves.
force
To break the sound ______, you have to go faster than the speed of sound.
barrier
The layer of gases surrounding the Earth or other planets.
atmosphere
This means the journey downwards from a higher point to a lower point, for example from space to the surface of the Earth.
free-fall
The force which stops things on Earth floating away. Newton discovered it when an apple fell on his head
gravity
A machine with moving parts that converts power into motion, for example in a car.
engine
The gas that we need to survive.
oxygen
People can jump out of planes wearing one because it makes them fall more slowly
parachute
A very light gas.
helium
