Earth-Moon System
The Earth and Moon in Space
Cycles in the Solar System
Planets & Other Bodies
Gravity
100
It revolves around the sun.
What does the Earth-moon system revolve around?
100
when object passes through the shadow of another.
What is an eclipse?
100
in the late 1800s, the spread of railroads created a need for exact time and schedules
Why were 24 time zones set up worldwide?
100
Earth has an oxygen rich atmosphere and lots of liquid water
Why is Earth a planet that supports life as we know it?
100
a force of attraction between 2 objects
What is gravity?
200
an elliptical shape
What is the shape of the orbit of the Earth around the sun?
200
when the moon appears to completely cover the sun
What is a total solar eclipse?
200
24 hours
How long does it take Earth to rotate once on its axis?
200
chunks of rock that look like potatoes in space
What do asteroids look like?
200
the "stuff" that matter is made of
What is mass?
300
an imaginary line that passes through the Earth's center and it's North and South Poles.
What is the Earth's axis?
300
when the full moon passes through Earth's shadow
What is a lunar eclipse?
300
365 1/4 days
How long does it take Earth to complete one revolution around the sun?
300
balls of ice and rock that may have tails of gases
What are comets? or what do comets look like?
300
the result of gravity pulling on the mass
What is weight?
400
the sun's gravity
What causes the Earth-moon system to revolve around the sun?
400
craters, highlands, and marias
What are some landforms on the moon?
400
the point in Earth's orbit at which daylight hours are at their most or fewest
What is a solstice?
400
because of the iron oxide, or rust, in its soil
What does Mars appear red?
400
Gravity holds everything close to this planet
Why doesn't everything fall off the Earth?
500
because sunlight is reflected off its surface
Why does the moon appear to give off its own light?
500
molten rock came up through cracks in the moon's surface and cooled & hardened
How did maria form?
500
the point in Earth's orbit at which the hours of daylight and darkness are equal
What is an equinox?
500
It is so close to the sun that is temperature can be about 800 degrees F
Why is Mercury so hot?
500
you might have smaller gravitational pull and "float"
What may happen if you are on a planet smaller than earth?
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