Refer to the previous problem. How can one tell whether it is a sill which intruded between rock layers or whether it is a lava flow which was extruded on top of sedimentary rock and then was covered with other sediments?
Answer to relevant QuestionsWhat is the most obvious evidence that lava extruded under water?What coarse-grained (plutonic) rock consists of abundant calcic plagioclase plus olivine and pyroxene?Volcanoes are classified as active, dormant, or extinct. If they have erupted during the last 50 years, they are clearly classified as active. On what bases are dormant or extinct volcanoes classified, and how can geologists ...Figure 3.16 includes three sketches of the Hawaiian Islands. (a) What is the origin of the islands? They are volcanoesIn which type of climate is chemical weathering most effective?
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