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=Hey click on this to see our official logo!!!= =__//**Volcanoes and Tectonics Plate**//__=

**4 Types of Plate Boundaries** **1. Subduction** oceanic plate collides with continental plate **2. Spreading** or **Divergent Boundaries ** Two plates moving apart with new crust being formed between them - Sea Floor Spreading **3. Continental Collision** two continental plates collide and "pile up" **4. Sliding** or** Lateral Boundaries ** two or more plates slide past one another **Volcanologist** - Scientist who studies volcanoes. **magma** - molten rock inside the Earth Lava- molten rock on the surface of the Earth

 ﻿ Intrusive = plutonic **extrusive** = volcanic Mafic Lava-hotter than felsic - low viscosity - dark colored rocks **felsic lava**  -high viscosity - large amount of gasses - explosive **Lahar** - volcanic mud flow **Pyroclastic flow** - super hot gases flowing down a volcano at up to 200mph. **Aa** - hardened lava that is sharp and jagged **Pahoehoe** - hardened lava in a smooth "rope-like" surface **Tephra** - any solid ejected from a volcano **Ash** - tephra less than 2mm **volcanic bombs** - lava is ejected into the air and cools on the way back to the surface **3 Types of Volcanoes** Shield Volcano-**Composite Volcano-Cinder Cone** **Active** - Currently erupting or showing signs of an eruption **Dormant** - Has erupted in historic times - but shows no sign of erupting **Extinct** - Has not erupted in historic times

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