GEOLOGY 230 Study Guide - Midterm Guide: Plate Tectonics, Oceanic Crust, Triple Junction
Document Summary
Be able to identify and describe the main plate tectonic boundaries: a divergent boundary occurs when two tectonic plates move away from each other, when two plates come together, it is known as a convergent boundary. Two plates sliding past each other forms a transform plate boundary. What is a triple junction: a small area of heating and igneous activity in earth crust where a thermal plume rises from the mantle. The endless pathway aling which rocks of various kinds are changed into rocks of other kinds. Igneous - rocks formed by the cooling of molten materials. Sedimentary - rocks formed by the consolidation of loose sediment or by precipitation of minerals from a watery solution. Metamorphic rocks formed under the condition of high temperature and pressure. Mafic igneous rocks that form oceanic crust. Felsic igneous rocks that form continental crust less dense. Early atmosphere was probably formed from the gases given out by volcanoes (within).
