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Transcript of Metamorphic Rocks
rock into metamorphic rock? Heat and pressure deep beneath Earth's surface can change any rock into metamorphic rock. What changes when rock changes into metamorphic rock? Its appearance, texture, crystal structure and mineral content change. What happens the deeper a rock is buried in the crust? The pressure increases. What does this cause? Under high temperature and pressure, the minerals in a rock can be changed into other minerals. How do geologists classify metamorphic rocks? They classify them according to the arrangement of the grains that make up the rocks. What does the word "foliated" mean in Latin? Foliated means "leaf",which describes the thin, flat layering found in most metamorphic rocks. What are examples of foliated rocks? Slate, schist and gneiss are examples. How is slate formed? Slate is formed when heat and pressure change the sedimentary rock shale into slate. What may happen at these bands? Foliated rocks may split apart at these bands. What minerals form in slate during the change? Mica form in the slate. How are the mineral grains arranged in nonfoliated rocks? They are arranged randomly. Do nonfoliated metamorphic rocks split into layers? No, they do not. What are two examples of nonfoliated metamorphic rocks? Marble and quartzite are two examples. How does quartzite form? Quartzite forms out of sandstone. The weakly cemented quartz particles in the sandstone recrystallize to form quartzite, which is extremely hard. Uses of Metamorphic Rocks What are certain metamorphic rocks important materials for? Some are important material for building and sculptures. What are two of the most useful metamorphic rocks? Marble and slate are two of the most useful. How does marble form? Marble usually forms when limestone is subjected to heat and pressure deep beneath the surface. Why do architects and sculptures use marble in many buildings and statues? Marble has a fine, even grain. Therefore, it can be cut into thin slabs or carved into many shapes. It is also easy to polish. What is a famous example of a marble structure? The Lincoln Memorial in Washington, D.C. shows Abraham Lincoln in gleaming white marble. Why is slate useful for building? - It comes in many colors
- It is foliated, and therefore splits easily into flat pieces
- It can be used for flooring, roofing, outdoor walkways, chalkboards and as trim for stone buildings