18. • Sunlight comes from the sun to the
Earth. The sunlight that warms our
faces right now left the sun over eight
minutes ago. The sun warms the Earth.
20. The spinning
around like a
top is called
rotation. As it
spins only one
side faces the
sun. Day
begins when
our part of the
world turns to
face the sun.
21. Night falls when our part of the Earth
turns away from the sun. The side
facing away from the sun has
nighttime.
22. This rotation or spinning of Earth
causes day and night. The Earth
rotates on its axis. The axis is an
imaginary line through its center. It
rotates once every 24 hours causing
day and night.
23. Every day the
Earth travels
around the
sun. The
Earth and the
moon travel
together in an
orbit around
the sun once a
year.
24. One revolution around the sun equals
365 days. This revolution causes the
changing of the seasons.
• http://kids.msfc.nasa.gov/earth/seasons/Earth
25. When the Earth moves closer to the
sun, summer returns. When the Earth
moves farther away from the sun in its
orbit, winter returns.