What are geologists referring to when they mention the “Ring of Fire”?  volcanic activity during the Permian extinction an old country song volcanic activity in the Caribbean volcanic activity around the Pacific Rim   Which of the following is not a main type of volcano? shield gabbric cinder cone composite   Why are sedimentary layers of rock important to scientists? These layers give strong clues to past surface environments. These layers are not important to humans. You can find lots of gold in sedimentary rock layers. These layers give detailed clues about future earthquake

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