RocksGroup4


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Sedimentary Rocks__//**

Sedimentary Rocks are There are 3 types of sedimentary rocks which are __//**Clastic sedimentary rocks**//__,__//**Chemical crystalline**//__ and __//**Organic(bioclastic rocks.**//__


 * //__Clastic sedimentary rocks-__//** are formed from solid fragments of other rocks. **//__EX:__//** Shale,sandstone and conglomerate.


 * //__Chemical Crystalline-__//** are formed from the precipitation of minerals. **//__EX:__//** Dolostone and gypsum.


 * //__Organic(Bioclastic)-__//** are formed from the remains of plants and animals. **//__EX:__//** Decayed plants.

__//**The rock cycle-**//__ continuous dynamic set of process by which rocks are changes into other types of rocks.


 * __Igneous Rocks-__** are formed either under ground or above ground when molten rock solidifies. They are also formed when volcanoes erupt causing the magma to rise above the surface. When magma is above Earth, it is lava. Igneous rocks are formed as lava cools on the surface. Some examples of igneous rocks are granite, scoria, pumice, obsidian...

the process of forming metamorphic rocks inside the lithosphere is foliation. non-foliation is when there are no bands that is non-foliation. recrystallization is the process of increasing the size of mineral crystals. When there are parallel layers of minerals(which are caused by pressure on the rock) is called foliation. dynamic metamorphism- crushing and ductile flow of rocks. burial pressure- when pressure increases with depth due to the weight of the overlaying rocks.
 * __Metamorphic rocks__**- are formed by heat and pressure. metamorphic rocks form from existing rock by heat, pressure and chemicals.
 * low** grade includes **low** temperatures, **low** pressure and a particle suit of minerals and textures.
 * high** grade has metamophism that takes place at any degree **higher** than 320 degrees C.