Q2nd First Topic Flashcards
3 types of volcanoes
Active
Dormant
Extinct
11 vocal structures
Ash steam and gas
Crater
Secondary vent
Geyser
Dikes
Volcanic bombs
Magma chamber
Sills
Lave
Conduit
Main vent
Why do volcanoes erup?
Magma collects in magma chamber
Magma is added the pressure increase causing fractures
Magma is less dense than surrounding solid rock so rises
2 about plates
Plates are made from the LITHOSPHERE
lithosis broken up inyo TECTONIC PLATES which more around on top of the asthenosphere
Liquid and brittle so can structure and buckle
Lithosphere
Solid rock but plastic and can flow
Asthenosphere
2 types of eruption
Effusive
Explosive
Most violent erup
Effusive
Moving away each other
Divergent boundary
Towards each others
Convergent boundaries
Location of earth surface that has experienced active volcanoes
Hotspots
When two blocks of the earth
Earthquake
The surface where they slip
Fault or fault plane
Location below the earth’s surface
Hypocenter
Location directly above it on the surface of earth
Epicenter