Rock - a naturally formed solid piece of the Earth’s crust composed of a mixture of minerals All rocks have minerals. http://www.schooltube.com/video/503ca205aae459f4 7494/The-Rock-Cyclehttp://www.schooltube.com/video/503ca205aae459f4 7494/The-Rock-Cycle
Rocks that contain 1 mineral are called monomineralic. Rocks that contain more than 1 mineral are called polymineralic.
Do Now 1.What three factors are used to identify igneous rocks? 2.What processes cause the formations of the following rock types? (Igneous, Metamorphic, Sedimentary) 3.Where do sediments come from?
Types Of Sediments Clastic- Fragments of Other Rocks-Grain Size Evaporties- Sea Water evaplorates leaving behind sediments. (Salt) Precipitates- Chemical-Solutioning(ions) Biologic-Plankton, Diatoms Biologic- Terrestrial– Plants/Trees Marine- Shells, Coral, Stromatalites
Types of Sedimentary Rock Clastic or Fragmental - form from the fragments of other rocks (sediment)
Stream Deposition Cause of deposition- Velocity Decreases Sediment characteristics effecting deposition –Size – –Shape- –density
Size: Largest Particles Settle Fir st Shape: Roundest Particles Settle First Density: The most dense particles settle first.
Types of Metamorphism Regional - heat and pressure are applied to a large area of rock in collision zones of the Earth’s tectonic plates Contact or Thermal - rock is “burned” due to heat from lava or magma
Features in Metamorphic Rocks Some metamorphic rocks have a banded, striped, or layered appearance (foliation). Metamorphism can enlarge mineral grains or create new minerals.
Metamorphism can increase the density of a rock. Some metamorphic rocks have a distorted or twisted rock structure created by intense pressure. Metamorphism causes changes in rock through recrystallization.
Distribution of Rock Types on the Earth Sedimentary rocks tend to be found in a thin layers at the Earth’s surface. Igneous and Metamorphic rocks tend to form in mountain ranges.
The abundance of igneous and metamorphic rocks increase as you go deeper into the Earth.