California has been plagued with earthquakes over the centuries; earthquakes that are a severe danger to life and land. earthquakes are prevalent because in california

There are a few reasons why earthquakes are so common in California. First of all California has many, many fault lines. Also in California there are two plates the Pacific Plate and the North American plate, the Pacific plate moves past the North American plate about two inches each year. The strain of the two plates also contributes to the earthquakes.
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Since wxyz is 4, halfof that would be 2.