3. Earth moves in TWO
WAYS
1. EARTH ROTATION
-- The spinning of Earth on its
axis.
Axis
-the imaginary line that goes
through the center of the Earth.
“EARTH ROTATES AROUND ITS
AXIS ONCE A DAY.”
4. 2. EARTH REVOLUTION
---is the movement of the
Earth its orbit.
ORBIT
The path that an object follows
as it revolves around another
object.
“EARTH REVOLVES
AROUND THE SUN ONCE A
YEAR.”
5. Why do we have seasons?
The seasons are
caused by tilt of
Earth’s axis as it
moves around the
sun.
The Earth’s orbit
around the sun is
NOT a perfect circle.
It is an ellipse.
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Phases
The different shapes of the moon visible
from Earth.
The moon’s phases are caused by
changes in the relative positions of the
MOON, SUN, and EARTH as the moon
revolves around the Earth.
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Lunar Month
• It takes about 29.5 days for the moon to
complete a full cycle of phases from full
moon to new moon and back again.
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ECLIPSES
• Occurs when the shadow of one body in
space falls on another.
• Occurs only when the moon crosses
Earth’s ecliptic plane at the time of a new
moon or full moon.
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SOLAR ECLIPSE
• During a new moon, when a new moon is
between the sun and Earth, Earth may
pass through the shadow of the moon.
• It occurs when the moon casts a shadow
on a portion of Earth’s surface.
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Lunar Eclipse
• During a full moon, when Earth is between
the sun and moon, the moon may pass
through Earth’s shadow.
• It occurs when Earth casts a shadow on
the moon.
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TIDES
• Are the regular rise and fall of ocean
waters.
• caused mainly by differences in the
moon’s gravitational pull on Earth.