metamorphic rock formation how do metamorphic rocks form?
TRANSCRIPT
METAMORPHIC ROCK FORMATION
How do metamorphic rocks form?
METAMORPHIC ROCK
• “Metamorphasize”-to change shape• Formed by a change in temperature, pressure,
and being close to hot fluids (like magma, hot water deep
underneath) Metamorphic Rock will form in the orange areas around the magma due to the
extreme heat and pressure.
• Metamorphic Rock Simulation
METAMORPHIC ROCK
• Receive great pressure from the rocks layers above them that may flatten them
• Metamorphic rocks form from preexisting rock.
• Temperature increases with depth in Earth• Rocks do NOT melt, they bake and change• Metamorphic rocks are formed from
igneous rocks, sedimentary rocks, or other metamorphic rocks.
TYPES OF METAMORPHIC ROCK
• Foliated-minerals flatten and line up in layers or bands. The bands in foliated metamorphic rock look like pages in a book. Slate, one of the most common foliated metamorphic rocks, splits easily into thin slabs. – Ex.
slate-one of the most gneiss-forms when common, splits into thin
granite changes schist slabs
GRANITE to GNEISS
FOLIATED
• Bands found in foliated metamorphic rocks
TYPES OF METAMORPHIC ROCK
• Nonfoliated-minerals grow and rearrange but do not form layers– Ex. Quartzite and Marble
Everyday Uses with Metamorphic Rock
• Marble-used for statues like the Lincoln Memorial in Washington, D.C.
TYPES OF METAMORPHISM
• Contact Metamorphism-occurs in relatively small areas where rock comes close to magma and the heat “changes” the rock by recrystallizing it
• Regional Metamorphism-occurs in very large areas where large pieces of the Earth’s crust collide with each other causing friction so the pressure deforms or changes the rock (occurs during mountain building)
Metamorphic Rock Changing Into New Metamorphic Rock