In five half-lives, one-sixteenth of a radioactive substance will remain.
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Q24: Rapid cooling of molten rock produces large
Q25: Rocks such as basalt, on the right
Q26: Metamorphic rocks where minerals have been flattened
Q27: Relative age dating enables scientists to determine
Q28: Rock layers containing extensive fossils of organisms
Q30: Dates on zircons from Western Australia suggest
Q31: The earliest evidence of life on Earth
Q32: The crust of the Earth is thickest
Q33: The lithospheric plates are thought to move
Q34: Transform plate boundaries are places where shear
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