Famlies of Rocks: Igneous (volcanic), Metamorphic (, Sedimentary(earths surface) which are MAFIC? ferromags which are SIALIC? felsic) Extrusive vs Intrusive- extrusive magma flows out of earths surface, Intrusive does not reach earths surface. Andesite, Diorite Andesite can be considered as the extrusive equivalent of plutonic diorite. Andesites are characteristic of subduction zones, such as the western margin of South America. The name andesite is derived from the Andes mountain range. Rhyolite, Granite Rhyolite can be considered as the extrusive equivalent to the plutonic granite rock, and consequently, outcroppings of it often bear a resemblance to granite. Due to their high content of silica and low iron and magnesium contents, rhyolite melts are highly polymerized and form highly viscous lavas. They can also occur as breccias or in volcanic plugs and dykes. Metamorphic rocks the transformation of an existing rock type, the protolith, in a process called metamorphism, which means "change in form". The protolith is subjected to heat and pressure (temperatures greater than 150 to 200 °C and pressures of 1500 bars[1]) causing profound physical and/or chemical change. Regional vs Contact what produces these different textures? slate, phyllite, schist, gneiss- all metamorphic Where would you find these rock types? Surface of the earth How do these rocks form? sandstone, conglomerate, breccia, Chapter 3: Plate Tectonics- what is it ,how does it work? Heat source? Plate Tectonics Evidence ( e.g., magnetosphere (magnetic field) etc.) Plate Boundries: know all characteristics of the following: Check your graph on the presentation! Divergent- a linear feature that exists between two tectonic plates that are moving away from each other. These areas can form in the middle of continents but eventually form ocean basins Transform-when two plate rub together parallel causing earthquakes. Subduction- two tectonic plates meet and move towards one another,...