Up, Then Down

When you throw a ball up, it comes down.
Up, then down.
Up, then down.
When an airplane flies high, it lands low.
High, then low.
High, then low.
When the wind lifts up a kite, down it falls.
Lifts, then falls.
Lifts, then falls.
When a spaceship rises to space, to the Earth it descends.
Rises, then descends.
Rises, then descends.
When something goes up, gravity pulls it down.
Up, then down.
Up, then down.