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Related Flashcards
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Cards In This Set
| Front | Back |
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What
is the key reason for our days and nights?
|
The earth’s rotation
on its axis
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1) How
long does it take for the earth to complete one full rotation on its
axis?
|
24 hours (1 day)
|
|
What
is the lunar cycle?
|
The moon’s revolution around the earth
|
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How long does the lunar cycle last/How long does it take for the moon to complete one full revolution around the earth?
|
~29.5 days
|
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How long does it take for the moon to complete one full rotation on its axis?—How do we know this?
|
~29.5 days (the same as its revolution); We only ever see one side of the moon
|
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Draw and label the lunar cycle (assuming the sun is on the right).
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(See notes (diagram) taken in class on 10/5) or Page 482
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How does the appearance of the waxing phases differ from that of the waning phases (in terms of where the light is)?
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When sun is on the right: waxing is light on the right; waning is light on the left
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How do the gibbous phases differ from the crescent phases (in terms of how much light and where they are located in the cycle)?
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Gibbous phases are almost completely lit (closest to the full moon); Crescents are almost completely darkened (closest to the new moon)
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What is a tide?
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The rise and fall of earth’s waters on its coastlines
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What is an important fact to remember about tides (relating to where they can actually occur)?
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Tides occur in all bodies of water—They are just the most obvious in larger bodies of waters such as lakes and oceans.
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What is ultimately responsible for tides?
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The interaction of the earth, moon, and sun (the gravitational pull of the moon and sun on the earth’s waters)
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Describe the daily tide cycle.
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2 high tides and 2 low tides every day
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Describe the monthly tide cycle.
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Spring and neap tides (each occur ~twice a month)
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What is the arrangement of the earth, moon, and sun when a spring tide occurs?
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Straight line
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Draw diagrams showing the two possibilities for a spring tide.
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Moon, Earth, Sun OR Earth, Moon, Sun
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