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27 Cards in this Set
- Front
- Back
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how far is earth from the sun?
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93 million miles
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earth revolves in an orbit around the
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sun
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earth completes one ____ every 365 1/4 days
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revolution
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imaginary line that runs through earth from north to south
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axis
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earth ___ on its axis every ___ hours
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rotates, 24
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earths axis is tilted
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23.5 degrees
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if earths axis were not titled there would be no change in
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seasons
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on ___ earth;s northern axis is titled toward the sun
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june 21 or 22
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on summer solsctice there are more __ hours than any other day for the ___ hemisphere
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daylight, northern
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june 21 or 22 is called
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summer solstice
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on ____ earths northern axis is tilted away from the sun
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december 21 or 22
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dec 21 or 22
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winter solstice
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on winter solstice we have the __ amount of daylgith hours than any other day in __ hemisphere
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least, northern
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midway between solstices
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equinoxes
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on equinox days day and night are
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equal
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sept 22 or 23
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autummnal equinox
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march 21 or 22
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vernal equinox
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what is the radius of the earth?
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6370 km
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the boundries between layers are called
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discountinuities
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seismic waves travel faster through
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denser rock
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earth's three main shells
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crust mantle core
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2 parts of earth's crust
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continental and oceanic
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the crust under oceans is
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thinner
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the boundry between crust and mantle
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mono
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part of mantle that is partially melted
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astherosphere
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sold part of mantle
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mesosphere
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inner core is made out of
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iron with some nickel
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