According to the theory of plate tectonics, the cool and rigid lithosphere is separated into segments called plates. these plate move in a conveyor-belt fashion over the partially melted asthenosphere due to convection currents within the mantle.
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Answer:
Some common advantages of primary data are its authenticity, specific nature, and up to date information while secondary data is very cheap and not time-consuming. Primary data is very reliable because it is usually objective and collected directly from the original source.
Explanation:
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