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15
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How do we know which rock layer is older?
By the principle of superposition (the lower layer is older).
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banana
Go to last place!
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seesaw
Swap points!
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rocket
Go to first place!
Okay!
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lifesaver
Give 25 points!
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15
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Establish the correct sequence of the four eons of the Earth's history.
Hadean eon, Archean eon, Proterozoic eon, Phanerozoic eon.
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15
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How do fossils help us understand Earth's history?
They provide evidence of past life
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15
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What is absolute dating?
A method that gives the exact age of a rock.
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seesaw
Swap points!
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gold
Win 50 points!
Okay!
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shark
Other team loses 5 points!
Okay!
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banana
Go to last place!
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baam
Lose 25 points!
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rocket
Go to first place!
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fairy
Take points!
5
10
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20
25
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baam
Lose 20 points!
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15
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The element that is the product of radioactive decay is known as the...
daughter element
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The % of the parent isotope remaining after 1 Half Life.
50%
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The original element that undergoes radioactive decay is known as the...
parent element
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15
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What is radiometric dating?
A technique that uses isotopes
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15
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What is the name of the unit we are about to start?
Diversity of life
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15
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Absolute or relative? The first book was published in IV a.c.
Absolute
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15
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What is the half life of Carbon-14?
5730 yrs
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If only 25% of carbon-14 remains, how many years old is the bone? (Carbon-14 half-life: 5730 years)
11,460
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15
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The % of the parent isotope remaining after 2 Half Lives.
25%
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