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Sedimentary and Metamorphic Rocks : Sedimentary and Metamorphic Rocks This is part 2 of our series on the rock cycle and rock types.
Let’s look At Rocks, Shall We? : Let’s look At Rocks, Shall We?
Sedimentary Rocks : Sedimentary Rocks Formed by compaction of matter.
Comes in three categories depending on the materials that create them and how these materials were deposited:
Chemical
Clastic
Organic Primary forces behind Sedimentary rock formation are weathering and erosion.
Weathering-breaking down materials into smaller parts.
Erosion-carrying weathered materials and small matter to new locations.
Chemical Sedimentary Rock : Chemical Sedimentary Rock Form when minerals once dissolved in a solution are deposited because the water has evaporated or lost the ability to carry the mineral. In this manner the minerals precipitate from the solution. Common examples include halite (AKA salt rock).
Organic Sedimentary Rock : Organic Sedimentary Rock Form from dead organic matter.
Form in locations once under swamps, lakes, oceans, and dense forests and jungles.
These areas have large amounts of living matter that die, then decompose, and create sediment.
Clastic Sedimentary Rock : Clastic Sedimentary Rock Made from many types of sediment that come in all shapes, colors and sizes.
The smaller and more uniform the sediment, the more compact it can become.
Other Sedimentary Rock Facts : Other Sedimentary Rock Facts Is very commonly found but makes up only 5% of the Earth’s crust.
The lower the layer the older the layer. (Very important question sometimes found on MEAP Tests)
Colors depend on the sediments trapped in the rock.
Other Sedimentary Rock Facts cont. : Other Sedimentary Rock Facts cont. Can melt and become magma to later form igneous rock.
Can be pressurized and heated to form metamorphic rock.
Can be weathered and broken into sediment to create new sedimentary rock.
Is usually the easiest to weather and erode when compared to most igneous and metamorphic rocks because of the sediment particles it is made up of.
Pictures of Sedimentary Rock Formations From My Hike in The Arizona Mountains : Pictures of Sedimentary Rock Formations From My Hike in The Arizona Mountains Yes, this is me near the top!
Metamorphic Rocks!!!!!!! : Metamorphic Rocks!!!!!!!
And More Metamorphic Rocks!!! : And More Metamorphic Rocks!!!
Like the Previous 2 Pictures Suggest… : Like the Previous 2 Pictures Suggest… We commonly find Metamorphic Rock near plate boundaries where crust is being pushed towards the mantle or folded into mountains. These areas provide the right ingredients:
Heat and Pressure
At a very intense level that is required to change sedimentary and igneous rocks into entirely new types!
How do These Areas Provide Heat and Pressure? : How do These Areas Provide Heat and Pressure? The pressure comes from massive amounts of crust folding and pressing down on other crust.
The heat comes from being so close to the mantle and pockets of scorching hot magma found at plate boundaries. Doesn’t our study of the Lithosphere seem so long ago?
Common Types of Metamorphic Rock : Common Types of Metamorphic Rock Marble From Limestone that turns to Calcium Carbonate.
Phyllite from Mica (Yes, Phyllite is spelled right!)
Quartzite from Quartz
Thanks for joining in, we’ll discuss more on metamorphic rock next week and prepare for the unit test! Yes! It is actually around the corner!!! Any questions??????