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Professor Robinson: A large meteorite impact crater in a certain region was thought to be the clue to explaining the mass extinction of plant and animal species that occurred at the end of the Mesozoic era. ████████ ███ ███████████ █████████ ██ █████ █████████ ██ ███ ████ █████████ ████ ███ ██████ ████ ██████ ████ ██████ ███ ███ ███ ████████ ████ ██████ █████ ████████████ ████ ███████ ███ ████████ ██ ███████ ████████ █████ ██ ████ █████ ███ ███ ██████████████ █████ █████████ ██ ███ ████ ███████ ██████ ████████ █████████ ████ ██████ ███████ ████████ █████ ███ ████████ ██ ███ ████ ██ ███ ████ ███████████
Summary
The author concludes that the meteorite that formed a large impact crater was not the cause of the mass extinction of plants/animals that happened at the end of the Mesozoic era.
Why? Because of the following:
There’s a crystalline structure of rocks recovered from the site of the crater.
When molten rocks (melted rocks) crystallize, they display the polarity of the Earth’s magnetic field at the time they crystallize.
The recrystallized rocks found at the site display a polarity that’s different from the polarity that existed at the time of the mass extinction.
Notable Assumptions
The author makes at least the following assumption about timing:
The molten rocks recrystallized around the same time that the mass extinction occurred. (This is why the author thinks the differing polarity shows the meteor didn’t cause the extinction.)
19.
Each of the following is ██ ██████████ ██ █████ █████████ ██████████ ████████ ███████ ███████
a
The crater indicates ██ ██████ ██ ████ ████ ██████████ ████ ██ ████ ██████ ███ ████ ███████████
b
The recovered rocks ██████████████ ███████ █████ ████ ███████
c
No other event ██████ ███ █████ ██ ████ █████ ███ ██████ ██████ ███ ███████
d
The recovered rocks ██████ ██ █ ██████ ██ ███ ██████ ████ ██████ ███ ███████
e
The mass extinction █████ ████ ████████ ████ █████ ███ ██████ ████ ██████████ ██████ ███