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Chapter 10 Section 1 1. Viscosity= A measure of fluid’s substance to flow 2. Vent= A opening in the surface of earth through which molten rock and gases are released 3. Pyroclastic Material= Volcanic rock during an eruption, including ash, bombs, and blocks 4. Volcano= A mountain formed of lava and/or pyroclastic Material 5. Crater= The depression at the summit of a volcano or that which is produced by a meterorite impact 6. Shield Volcano= A broad, gently sloping volcano built form fluid basaltic lava’s 7. Cinder Cone= Small volcano built primarily of pyroclastic material ejected from a single vent 8. Composite Cone= Volcano composed of both lava flow’s and pyroclastic material 9. Caldera= Large depression typically caused by collapse or ejection of the summit area of a volcano SECTION 2 10. Pulton= Structures that result from the cooling and hardening of magma at depth 11. Sill= forms when magma is injected along sedimentary bedding surfaces, parallel to the bedding planes 12. Laccolith= A massive igneous body intruded between pre-existing strata 13. Dike= A tabular- shaped intrusive igneous feature that occurs when magma is injected into fractures in the surrounding rock, cutting across pre-existing rock layers 14. Batholith= The largest intrusive of igneous bodies 15. Geothermal Gradiant= A change in temperature depth 16. Decompression melting= melting due to a drop in confining pressure that occurs as rock rises SECTION 3 17. Intraplate Volcabism= Occurs within a plate, not at a plate boundary