The energy for plate tectonics comes primarily from radioactive decay in our core.
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Q2: Subduction of higher density oceanic plates under
Q3: The three most abundant gases in our
Q4: The ozone layer blocks much of the
Q5: The ozone layer lies at the boundary
Q6: We find from igneous rock dating that
Q7: In the past, most of the landmass
Q8: Greenhouse gases in our atmosphere trap just
Q9: The hydrosphere accounts in large part for
Q10: Almost all the oxygen in Earth's atmosphere
Q11: The most abundant gas in Earth's atmosphere
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