The seasons keep changing because the tilt of the earth's axis never changes while the earth circles the sun.
(The seasons; keep changing; because the tilt of the earth's axis never changes while the earth circles the sun) (the tilt of the earth's axis; never changes; T:while the earth circles the sun) (the earth; circles; the sun)
The seasons the tilt of the earth's axis the earth
keep changing never changes circles
because the tilt of the earth's axis never changes while the earth circles the sun
T:while the earth circles the sun
the sun