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when a volcano is active, over its life time (thousands of years longer than ours) it 'erupts' or 'oozes' magma/lava onto the top crustal layer of the earth, every time this happens over those thousands of years, it gets a little bit higher as more and more material builds up from the previous times the material was deposited from lava flows and violent euptions and ash clouds. You can 'go back in time' in a way by going to Hawaii islands or white island -New Zealand (one of the youngest and most active volcanic regions of earth) and see this process take place for a fraction of a second (which is the scale of how much of the entire process you would see if the process lasted for a few hours!)

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