Without oxygen, humans would not be able to breathe., When the rocket left the Earth’s atmosphere, the sky became completely black., The pilot pushed the engine to make the plane go faster., The astronaut returned safely to Earth in a small capsule., When you drop a ball, gravity pulls it down to the ground., A hot-air balloon can carry people high into the sky., When the skydiver jumped out of the plane, he opened his parachute after a few seconds., The airplane created a loud noise when it broke the sound barrier., The wind was a powerful force that pushed the boat across the water., Many party balloons float because they are filled with helium.

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