What are some other theories which explain why there are different kinds of magma?
Answer to relevant QuestionsWhat is the source of the basaltic lavas of the midoceanic ridges?How does the rate of cooling of a magma affect grain size of the resultant rock, and why? (See Fig. 3.4.)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?Name the coarse-grained (plutonic) rock consisting primarily of hornblende and sodic plagioclase.What could happen to the cities shown in Fig. 3.13 if any of the nearby volcanoes erupted?
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