Volcanic Materials
Main ingredients of lava
What are silicate and gas?
Vent or opening in the crust
What is a volcano?
Long, horizontal pluton
What is a sill?
Type of growth where magma moves up inside the cone
What is intrusion?
Rough surface, carries rough rock and cooled lava
What is aa?
He discovered basalt comes from volcanoes
Who is Nicholas Desmarest?
Vertical plutons
What are dikes?
Type of growth where magma and other materials exit the cone
What is extrusion?
Lava that flows easily, smooth or billowy surface, swelling or waves
What is pahoehoe?
The three original names for volcano categories
What are recent, older, obscured?
Lightweight porous rock
What is pumice?
Subduction zone, one tectonic plate slides under another, heat generated melts the mantle, pressure forces magma up, much stronger eruptions
What is the Pacific Ocean?
Magma cools and hardens underground
What is a pluton?
Three regions where volcanoes can form
What are hot spots, subduction zones, and divergent plate boundaries?
Solid extrusive materials, ash and rock
What are pyroclasts?
Zone with divergent plate boundary, plates separate, rifts, heat, gases, magma escape, generally weak eruptions
What is Mid-Atlantic Ridge?
The largest intrusion
What is a batholith?
The three purposes of a volcano
What are cooling system for the earth, recycle atmospheric gases, replenish soil with nutrients?
The largest pyroclast
What are volcanic (or lava) bombs?
Three plates that make up the Ring of Fire
What are Pacific Plate, Cocos Plate, Nazca Plate?