Earth moves through space in two major ways:
rotation and revolution
Earth's rotation causes...
day and night
Earth's orbit is:
Earth has seasons because of its ____ __ _____ as it revolves around the sun
axis is tilted
Earth's axis is tilted at ___ degrees
The area around the equator receives _____ sunlight.
Near the poles, sunlight arrives at a _____ angle.
Earth is _____ from the sun when it is summer in the Northern Hemisphere.
The two equinoxes are the _______ and ______.
The two solstices are the ________ and _______.
What states that every object in the universe attracts every other object?
Newton's law of universal gravitation
What keeps all objects in the universe to be attracted to each other?
What does the strength of the force of gravity depend on?
mass and distance
What states that an object at rest will stay at rest and an object in motion will stay in motion unless acted upon by a force?
Newton's first law of motion
What two factors cause the Earth and moon to remain in their orbits?
inertia and gravity
What causes the phases of the moon?
the changing relative positions of the moon, Earth and sun
The phase of the moon you see depends on how much of the ______ side of the moon faces Earth.
About how many days does it take to complete the moon cycle?
What is the order of the 3 celestial bodies during a solar eclipse?
Sun, moon, Earth
What is the order of the 3 celestial bodies during a lunar eclipse?
Sun, Earth, moon
The smaller a planet, the smaller its ___________ force.
What planet takes the fastest to revolve around the sun?
What are the 3 characteristics do the inner planets have in common?
density, size, surface
Venus has the ________ effect.
Does Mercury have an atmosphere?
The outer planets have ____ moons.
Uranus rotates from ___ to ______.
In the Southern Hemisphere, the summer solstice occurs when the sun is farthest _____.
Because the moon rotates once for each revolution around Earth, you never see the ___ side of the moon from Earth.
A total solar eclipse is visible from only within the moon's ______.
a solar eclipse can be seen only during the ___.