Metamorphic Rocks Lesson #14. 1  Rocks are formed on Earth as igneous, sedimentary, or metamorphic rocks. Igneous rocks form when rocks are heated to the melting point which forms magma. 2  The diagram above shows you how the rocks on Earth have been changed continually over time from one rock type to another.
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The customer service department closes at 5 PM on Sunday. 1  New Service Quotes: 1-877-896-9320. 2  Customer Service: 1-888-413-8970.