Dates on zircons from Western Australia suggest that the oldest crustal rocks are more than 4 billion years old.
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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
Q29: In five half-lives, one-sixteenth of a radioactive
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
Q35: The Earth's magnetic field has reversed itself
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