Ch. 7 Earth in
Space
Earth’s Orbit
The shape of the Earth is
a sphere, but not a perfect
sphere. It bulges a little at
the equator and is a little
flattened at the poles.
1.
Earth’s Orbit
Earth’s round shape is
caused by gravity,
particles are pulled to the
center giving the Earth it’s
round shape.
2.
Quiz time! Look on pg. 100 in your workbook.
(1.) What force shaped
Earth into a sphere?
Quiz time! Write the answer to this question
under 1 on pg. 100 in your workbook.
(2.) When objects are
farther apart, their
gravitational pull is
(weaker or stronger).
Quiz time! Check your answers, how did you do?
(1.)Gravity shaped the Earth.
(2.)When objects are farther
apart their gravitational
pull is weaker. When an
object is larger the
gravitational pull is
stronger.
Earth’s Orbit
3. The Earth spins on its axis, the
imaginary line drawn from the
north pole through the earth to the
south pole.
Earth’s Orbit
The rotation of the
Earth on its axis is what
causes day and night.
4.
Earth’s Orbit
The earth moves along a
path around the Sun, this
movement is called
Revolution and takes
365 days (1 year) to
complete this path.
5.
Quiz time! Write your answers on pg. 101 below
question 3.
(3.) How much time does it
take for Earth to complete
one revolution around
the Sun? What causes Day
and Night?
Quiz time! Check your answers, how did you do?
(3.) Revolution around
the Sun takes one year
(365 days). Day and
night is caused by the
Earth rotating on its
axis.
Earth’s Orbit
The curved path around
the sun is called an orbit
and forms an ellipse or
oval shape.
6.
Earth’s Seasons
7. Because the Earth is tilted on
its axis, the hemisphere facing
the sun will receive more direct
sunlight and will be warmer.
Quiz time! Look on pg. 102 in your workbook?
(4.) Why does Earth have
seasons?
Quiz time! Look on pg. 102 in your workbook?
(5.) When it is winter in the
northern hemisphere,
what season is it in the
southern hemisphere?
a. spring b. summer
c. fall or d. winter?
Quiz time! Check your answers, how did you do?
(4.) The Earth has seasons
because its tilted on its
axis, as the Earth orbits
around the sun the angle
at which sunlight strikes
the surface changes.
Quiz time! Check your answers, how did you do?
(5.) The hemisphere tilted
toward the sun will have
more daylight hours.
When it is winter in the
northern hemisphere it is
summer in the southern
hemisphere.
Earth’s Solstices
8. Twice a year the Sun reaches
its greatest distance north and
south of the equator. The
Summer Solstice -June 21 or
22, when the Sun is highest in
the sky at noon.
Earth’s Solstices
9. Winter Solstice- December
21 or 22, when the Sun is lowest
at noon.
Quiz time! Look on pg. 103 in your workbook?
(6.) If the Sun is highest in
the sky at noon during
the summer solstice,
when is it lowest?
Quiz time! Check your answers, how did you do?
(6.) During the winter
solstice in December.
Earth’s Equinoxes
10. At an equinox the Sun is
directly above the Earth’s
equator and the lengths of day
and night are nearly equal all
over the world. The tilt of the
Earth is not toward or away
from the Sun.