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Nuclear activity in the core of the earth forms convection currents within the mantle which upon reaching the surface tend to pull the tectonic plates apart, Continents which are resting on these plates will therefore move as this "conveyor belt" travels beneath them.
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How have valleys changed?
How have valleys change over time?How have valleys change over time?How have valleys change over time?
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Yes. We currently believe that it has changed over time. It is believed that the Earth was first dry and that water was delivered to it later by cometary or meteoric impactors.
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Elk hunting
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How did Niels Bohr model changed over time?
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How has the seismograph changed over time?
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