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This lesson explores metamorphic rocks, which are formed from the transformation of igneous or sedimentary rocks under varying pressure and temperature (P-T) conditions. Discover how granite becomes gneiss through heating and pressurization, and learn about the rock cycle that connects igneous, sedimentary, and metamorphic rocks. Examples include the transformation of limestone to marble, sandstone to quartzite, and shale to gneiss. The lesson also covers progressive metamorphism and how rocks indicate environmental changes.
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Lab 07 ONLINE LESSON Use down or up arrows to navigate
There’s a mineral There’s a mineral There’s a mineral
A metamorphic rock is a reprocessed igneous or sedimentary rock…
A metamorphic rock is a barometer, an indicator of changes in pressure and temperature…(PT)
When a metamorphic rock undergoes changes in PT, the texture of the rock changes
Wow. Did you see that. Do you want to see it again? Go forward…
The original rock called granite was heated up and pressurized such that the texture of the rock changed…
The rock started out as an igneous rock then ended up as a transformed metamorphic rock called gneiss…
The Rock Cycle tells us that rocks first start out as igneous rocks…
Weathering is the process of breaking up rocks…big rocks turn into small rocks
Sediment (small rocks) is transported and deposited where it forms into sedimentary rock…
Some metamorphic rocks encounter so much change that they go back to an igneous state…hence the rock cycle…
Pressures increase until the minerals in the limestone are altered…
Pressures increase until the minerals in the sandstone are altered…
Metamorphic rocks are indicators of changes in pressure and temperature
Then onto phyllite (7)…and schist (8) then gneiss (9) (5) (6) (7) (8) (9)
This is called progressive metamorphism…a parent rock starts out as shale…
Then goes through a series of transformations until the end product of gneiss…
