Flashcards
Exam 1
Cards in this deck (39)
- 1This type of igneous remains IN the earthIntrusive
- 22 factors that influence if a rock is extrusive or intrusive.1.Pressure and Gas: Can create bubbles which makes the melt bouyant. more melt=more bouyant
2. Viscosity: the resistance to flow. - 3What effects viscosity?Temperature. Hot temp=low/liquid viscosity.
- 4If silica increases in content in a rock, what happens to viscosity?viscosity raises.
- 5T/F covalent bonds are hard to breakTrue!
- 6Why is greater silica content rocks harder to breakthe silica tetrahedra. It needs to break more of them before it can flow. it's a very dense pattern.
- 7What type of igneous rock is graniteintrusive
- 8What type of rock is rhyoliteextrusive
- 9Higher silica content =felsic, high viscosity
- 10Lower silica content=mafic, lower viscosities
- 11Name an extrusive mafic rockbasalt
- 12Name an intrusive mafic rockgabbro
- 13These melts do not reach surfaceintrusive igneous rocks
- 14this rock cools slowly and forms large crystalsphaneretic
- 15magma that cools within earth is called:pluton
- 16What is a dikesmall structure perpendicular to surrounding rock layers. Builds a wall between layers vertically.
- 17Rock structure that runs parallel to the surrounding rock layers.sill
- 18Batholith is a structure that...very large! cuts across all other layers...rude.
- 19What is a stocksmaller batholith that cuts across all other layers
- 20This rock structure can be small or massive. it is mushroom shaped from pooling under layerslaccolith
- 21short term for volcanic neckancient volcanic conduit
- 22Where are intrusive igneous bodies typically found?convergent boundaries, subducting plate melts, also a volcanic neck or historical volcanism and hot spots.
- 23melts reach the surface and cools very quickly/instantaneously forming no crystalsextrusive igneous rocks
- 24very viscous melt allows for quite volcano eruption since the melt is verrry runny.low viscosity=quite volcano
- 25in a volcano, what make it erupt violentlyhigh viscosity. it traps gasses and make it loud.
- 26that is a lava flownon-violent and low viscosity volcanic eruption
- 27Aajagged, angular pieces from high viscosity flowing melt
- 28Pahoehoerope, rounded texture from low viscosity flow
- 29How is a lava tube madea cave that was made from cooling/flowing lava.
- 30Columnar joints are...6-sided fracture-bound columns formed by contracting/shrining lava.
- 31Pillow Lava!lava extruded from the sea. looks like toothpaste and looks like a pillow!
- 32What is known about pyroclastic eruptionsthey are violent! Think pyro/fireworks esploding
- 33how small is volcanic ashsmaller than 2mm.
- 34Why is ash a hazardwhen a plume is emmitted from the volcanic eruption the plume goes super far up in the atmosphere. it can cover a large area and is bad for people.
- 35These are large rocks thrown from a volcanic eruptioncinders/blocks/bombs
- 36Ash flow/Nuee Ardentes are the most dangerous...why?rapidly spreads after falling. cannot out run this. can flatten buildings, trees, etc. is extremely hot and can burn things instantly.
- 37Mudflow-Laharmelted snow that picks up dirt, creating mud....like a rock/earth slide.
- 38Volcanic Gassespoisonous gasses-sulfur and carbon dioxide. suffocation occurs. and acid rain.
- 39—
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- Geology Flashcards on Exam 1 , created by Cj Alsenay on 07/02/2017.
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- Cj Alsenay
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