Since Hawaii is experiencing some massive geological events right now, we reviewed the three types of rocks: sedimentary, metamorphic, and igneous. Students were introduced to the following terms: intrusive rocks ones that are formed under the surface (magma) -cools slowly -coarse grained -smooth -crystalline shaped extrusive, ones that are formed at the surface (lava) -cools quickly -fine grained -lack of crystals or none at all With plate tectonics: Divergent Boundary: plates pushing away. Convergent Boundary: plate pushing towards each other causing a subduction zone. -flux melting-water cooling the magma less dense rocks rise to the top Types of volcanoes- Cinder cones- small and explosive Shield Volcano-very wide and short, very thin, low viscosity Eruptions are quiet example of this: Kilauea Fissure-crack in the ground and lava comes out of it. Stratovolcano (aka composite) -tall and wide -Explosive  Caldera-a collapsed magma chamber that creates a crater inside the volcano walls after an eruption |
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