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the universe
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why do we have time zones?
to make sure the time matches up with the amount of light that part of the earth is recieving.
which way does the earth rotate
eastward, or counterclockwise from the north pole
what is an atmosphere?
a layer of gases that sorround an astronomical object
how did the universe form?
as a result of the big bang
how many natural satellites does the earth have?
one, the moon.
what are planetary systems?
a star and all the bodies that orbit around it
when did life on earth begin?
around 2 billion years ago
What is the surface  of the earth?
510 million kilometers squared
Why does the earth look blue when viewed from outer space?
all the liquid water on the surface
What is scale?
the relationship between the distance measured on a map and the distance in real life
what is longitude?
the distance from any point on earth to the prime meridian.
What is latitude?
the distance from any point to the equator.
what are meridians?
imaginary semicircles that go from one pole to the other, used for navigation.
What are parallels?
imaginary circles that run perpendicular to the earths axis of rotation, used for navigation
why are the tropics so hot?
the sun's rays strike the earth nearly perpendicular, concentrating the heat
What consequences does the earth's orbit around the sun have combined with its tilted axis of reversal?
different seasons
What does the earth orbit around?
the sun
Why is the earth's rotation necessary for life?
without it, half of the planet would be too hot and half would be too cold
how long does it take for the earth to complete one full rotation?
23 hours and 56 minutes
What is a geoid shape?
an imperfect sphere.
What are the three characteristics that make earth different?
moderate temperature, oxygenated atmosphere, abundance of liquid water
how long ago was the earth formed
around 4.6 billion years ago
what is the universe made up of?
stars, celestial bodies, interstellar matter, and empty space
groups of celestial bodies are called?
galaxies
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