Earth's rotation takes about
24 hours
Day and night are caused by
Earth's rotation on its axis
One complete revolution of Earth around the Sun takes about
one year
The Sun and Moon seem to move across the sky each day because of Earth's ____________________ on its axis.
rotation
The Moon can be seen from Earth because ____________________ reflects off the Moon's surface.
sunlight
Any object that revolves around another object in space is called a(an) ____________________.
satellite
The Moon rotates on its axis approximately every _________________ days.
30
___________ are caused by the force of gravity from the Sun and Moon acting on Earth.
Tides
The two factors that combine to keep Earth and the moon in their orbits are
gravity and inertia
The tendency for an object in motion to remain in motion is called ____________________.
inertia
The tendency of a moving object to continue moving in a straight line or a stationary object to remain in place is called
inertia
All objects are attracted to each other by the force of
gravity
The strength of the force of gravity depends on
the masses of the objects and the distance between them
The force that pulls the Moon toward Earth is called ____________________.
gravity
The phase of the moon you see depends on
how much of the sunlit side of the moon faces Earth.
Because the moon rotates once for each revolution around Earth,
you never see the far side of the moon from Earth.
The amount of the lighted side of the moon you can see is the same during
first quarter and third quarter phase.
During what phase of the moon can a lunar eclipse occur?
full moon
When the light is on the right side of the moon the light is said to be _____________.
waxing on
After the full moon, the light starts waning away on the __________________.
right side
During which phase of the moon can a solar eclipse take place?
new moon
When are tides the highest?
When the Sun, Earth and Moon are nearly in a line
Earth has seasons because
its axis is tilted as it moves around the sun.
When the north end of Earth's axis is tilted toward the sun, North America will experience
more direct rays and longer days.
In the Southern Hemisphere, the summer solstice occurs when the sun is
farthest south.
An equinox occurs when
neither end of Earth's axis is tilted toward or away from the sun.
The times when day and night are of equal length are called ____________________.
equinoxes
During what two months do the equinoxes occur?
March, September
During which two months do the solstices occur?
June, December