| Relative Dating | Absolute dating | Geologic Time Line | Positive Feedback loops |
|---|---|---|---|
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On the bottom
In a sequence of layers, where are the oldest ones?
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They change into stable daughter atoms.
What happens to radioactive elements when they decay?
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Eons
What are the largest divisions of geologic time?
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The predator prey relationship
Which of the images DOES NOT show a positive feedback loop?
|
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The intrusion or fault that cuts through it
What is newer, a sedimentary layer, or an intrusion or fault that cuts through it?
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The amount of TIME it takes for half a sample to decay from radioactive parent into stable daughter.
What is an element's half life? (define half life)
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The Hadean Eon
During which eon did the following occur: formation of the Moon, Earth stratifying, and Earth’s crust forming?
|
Complete this sentence: positive feedback loops...
|
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An index fossil
What do you call a fossil that lets you identify the age of a rock layer?
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1:3
If you have 19.3 grams of a radioactive substance, what will be the ratio of radioactive material to stable material after 2 half-lives?
|
Multicellular life, Snowball Earth
What separates the Phanerozoic Eon from the previous eons?
|
Meteor impact
Siberian Traps erupt Global warming due to gases Oceans warm Methane released Global warming Pink bacteria thrive and release poisonous gases 95% of all species die
List the events of the Permian Mass Extinction and indicate where a positive feedback loop is happening.
|
|
T A I F
Put the events in this rock in order from oldest to youngest
|
4 half lives
If there is 16 grams of radioactive material in a sample, how many half lives will it take until only 1 gram is still radioactive?
|
Cyanobacteria (blue-green algae) doing photosynthesis, stromatolites
During the Proterozoic Eon, why did the Earth’s atmosphere begin to fill with oxygen?
|
Earth cools
Water freezes Ice reflects sunlight Volcanoes erupt putting CO2 into atmosphere Global warming melts ice CO2 mixes with rain to make carbonic acid rain Acid rain cleans atmosphere and dissolves rock Carbon from acid rain trapped in rocks
List the events of the Snowball Earth and indicate where a positive feedback loop is happening.
|
|
D R B F T
Put the events in this rock in order from oldest to youngest
|
17,190 years old
If a fossil has a 7:1 ratio of nitrogen-14 to carbon-14, how many years old is it? (1 half-life of C-14 is 5,730 years.)
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Mass extinctions, different life forms dominate (Paleozoic: invertebrates, Mesozoic: reptiles, Cenozoic: mammals)
What separates the eras of the Phanerozoic Eon from one another?
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Predict our future climate and speculate about positive feedback loops in it.
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