Shared Flashcard Set

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Earth and Moon
revolve, rotation, characteristics
28
Science
8th Grade
09/14/2006

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Cards

Term
What is a Lunar eclipse?
Definition
earth's shadow covering the moon
Term
What causes the seasons?
Definition
the earths tilt
Term
What is rotation?
Definition
earths spin around its axis
Term
Whats a revolution?
Definition
orbit around the sun
Term
What causes a year?
Definition
earths revolution
Term
what causes a day and night?
Definition
earths rotation
Term
Which way does earth rotate?
Definition
eastward
Term
How many degrees is the tilt?
Definition
23.5 degrees
Term
What is a leap year and why do we have them?
Definition
every 4 years there is an extra day added. this is because the earths revolution takes 365 and 6 hours to complete
Term
How do we get sprind and fall?
Definition
when the tilt of the earth is not toward or away from sun
Term
why does the sunrise in the east and set in the west?
Definition
because the earth rotates eastward
Term
how long is the lunar phase cycle?
Definition
29.5 days
Term
Which word means getting darker?
Definition
waning
Term
which word means getting lighter?
Definition
waxing
Term
Do we always see the same side of the moon?
Definition
yes
Term
Why is the Lunar Phase Cycle take 29.5 days when a moons revolution is 27.3 days?
Definition
This is because the earth is revolving too. Si the moon takes an extra 2 days to catch up with the earth
Term
sun---moon---earth
What is this?
Definition
solar eclipse
Term
sun----earth---moon
What is this?
Definition
lunar eclipse
Term
What is the solstice?
Definition
unequal daylight and nighttime hours
Term
what is the equinox?
Definition
when neither hemisphere is facing sun or away, equal daylight and night hours
Term
How much of the sun is always lit?
Definition
half
Term
what is moonlight?
Definition
reflected sunlight
Term
how much of the moon is always lit?
Definition
half
Term
what causes the phases of the moon?
Definition
by the angle at which we view lit against unlit side
Term
Does the moon rotate?
Definition
yes
Term
does the moon revolve?
Definition
yes around the earth
Term
If the moon revolves around the earth then why do we not have eclipses twice a month?
Definition
because they aren't in direct linement. moon is at a 5 degrees difference
Term
If the usa sees a full moon, what will china see?
Definition
full moon, its the same
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