<span>A fast-moving flow consisting of a mixture of water and volcaniclastic debris is lahar. It is a kind of mudflow that is made up of materials that flow down a volcano. It has the consistency of wet concrete but they go down volcanoes at rapid speeds.</span>
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The Fertile Crescent is basically where human civilization started. It stretches from Mesopotamia and across the Mediterranean coast to Egypt. Early civilizations depended on agriculture. To make agriculture, you need a river because it is a good water source to help grow your crops.
If you look at the map I have provided below, you will see that there are tons of rivers. This would make it very easy for settlers to grow crops. This means that sea tides and eroding mountains aren't the answer. I don't think the rivers were flooding and natural canals is an oxymoron because canals are artificial waterways, but this all should give you and idea.
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The Earthquake epicenter is located next to the Japanese islands, as it is seen and labeled on the picture.
The tectonic plate that is to the right and below the epicenter is the Pacific Plate- this is easy to see on the picture.
The plate to the left is a little more confusing, but if you look closely, it is the Okhotsk plate- you know this because there are no boundaries between the name of the plate and the epicenter.