The fact that volcanic rock has often been found early in the rock record but less frequently in later rock layers suggest to scientists the following conclusion about early earth: <span>volcanic activity was more common in the past than it is today.
</span>Besides volcanic activity in general, also huge volcanic eruptions<span> were much </span>more common than today<span>.</span>
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Since the Sun rises in the east and the Earth moves from west to east, time on the eastern hemisphere is ahead of the Greenwich and that on the western hemisphere is behind it.
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