Meteorite bombardment likely to have created the Earth's oldest rocks

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Scientists have found that 4.02-billion-year-old silica-rich felsic rocks from the Acasta River, Canada -- the oldest rock formation known on Earth -- probably formed at high temperatures and at a surprisingly shallow depth of the planet's nascent crust. The high temperatures needed to melt the shallow crust were likely caused by a meteorite bombardment around half a billion years after the planet formed.
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Meteorite bombardment likely to have created the Earth's oldest rocks was originally posted by Health Nutrition And Fitness News