Download PILEO GRADO 8° The Earth, Sun and Moon On most day the sun

PILEO GRADO 8°
The Earth, Sun and Moon
On most day the sun shines in the sky during
the daytime. On other days both the sun and
the moon appear in the sky at the same
time. At a glance the sun and moon appear
to be the same size . But the difference in
their sizes is huge!
HOW DOES THE EARTH MOVE?
Sit very still without moving a muscle. No
matter how still you sit, you are moving. You
cannot tell that earth carries you with it as a
moves . The earth spins -or rotates- as a
basketball spin son the tip of a player’s
finger. The earth makes one rotation when
it spins around once. The time for each
rotation is 24 hours –what we call a day.
The earth rotates around an imaginary line
that runs trhrough its center. This line is the
earth´s axis. The earth´s rotation causes
daylight and night. The sun does not really
rise in the east or set in the west. The sun
only appears to rise and set because the
earth rotates from west to east. The earth
also moves in a path around the sun. This
path –an orbit- is shaped like an almost
perfect circle, as shown. The earth moves
along this orbit- or revolves- around the sun.
The earth completes one revolution when it
has moved once around its orbit. One
revolution takes about 365 days- what we
call a year. The earth revolves around the
sun for the same reason that objects fall
downon earth-gravity. When you throw a
ball into the air, you know that it will return
to the ground. A high-flyng kite will return to
earth when the wind diez down. Gravity
makes objects return to earth and keeps
the earth revolving around the sun.
Without gravity, the earth would fly into
space , as the drawig shows. But because of
gravity, the earth”s motion is curved into an
orbit.
On earth the forcé of gravity on an object is
the object”s weigth. The more mas san
object has, the more gravity pulls on it. So
the object weighs more.
MATCHING
Number your paper frem 1-5 . Read the
description in column I . Next to each
number, write the letter of the Word or
words from column II that best match the
description in column I
COLUMN l
COLUMN ll
1 Star closet to the earth
a. gravity
2.Force that keeps you on earth and keeps
the earth in its orbita round the sun
b. Halley”s comet
3. Causes day and nigth on earth
c.
Mercury
4. Last one year
d.
the earth”s revolutionto t
5. planet closest to the sun
e. the sun
MULTIPLE
CHOICE
Number your paper from 6-10. Next to each number, write the letter of the Word or words that
the best complete the statement or answer the question.
6. How is the moon different from the
earth? The moon
9. Why does the moon appear to change
shape?
a. has no atmosphere.
a. Clouds get in the way.
b. has a steady temperatura near 50°
Celsius.
b. The earth’s shadow falls on the moon.
c. has a blue sky.
d. has a water.
c. We see different amounts of the moon’s
lighted side as the moon revolves around the
earth.
7. What causes high and low ocean tides?
d. Planets and starts often block the moon’s
light.
a. blowing winds.
10. The largets planet in the solar system is
b. ships moving across the ocean.
a. Saturn.
c. the moon’s gravity.
b. Urans.
d. hurricanes.
b. Earth.
8. Like Earth, Mars has
d. Jupiter.
a. an atmosphere containing oxygen.
b. polar caps.
c. large amounts of water
d. only one moon.