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Mathematics 19 Online
OpenStudy (anonymous):

How did scientists determine Earth has layers?

OpenStudy (anonymous):

by digging in the intermost core ;)

OpenStudy (amistre64):

by formulating hypothesises and doing tests.

OpenStudy (anonymous):

that too... o.0

OpenStudy (amistre64):

my first option was taken ... digging ;)

OpenStudy (anonymous):

lol xD

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