Eruptions
A mild eruption of gas and thin lava through several vents
Icelandic eruption
The largest type of pluton
Batholith
This can block out the sun, blow down trees and power lines, collapse roofs, and cover cities
volcanic ash
A porous rock sometimes formed by volcanoes
pumice
An eruption composed of bursts of dark ash, steam, and gas
Vulcanian eruption
A mild eruption of gas and thin lava through one vent
Hawaiian eruption
True or false: Plutons have smooth, even surfaces
True
What is a tiltmeter?
A tool that uses water to register changes in the Earth
This type of lava (when cooled) was fashioned into ancient tools and weapons
Aa
90% of volcanoes are formed where?
At subduction zones
The most violent type of eruption with hot ash and deadly pyroclastic flows
Plinian eruption
This type of pluton runs vertically and is typically straight
Dike
True or false: If an earthquake occurs near a volcano, you can be sure that the volcano will erupt soon
False
Describe aa
Lava that has a rough surface
Circular depressions that form when magma is withdrawn or erupts from a volcano
Calderas
Explosive eruptions of thick lava and steam or gas, as well as pyroclastic material and volcanic bombs
Strombolian eruption
What is a laccolith?
A large dome-shaped pluton
How does volcanic debris affect soil and crops?
Ash can initially smother crops, but volcanic debris produces very fertile soil
What are pyroclastics?
solid volcanic materials such as ash and rocks
How do volcanoes help to sustain creation?
They help ventilate the earth of the large amounts of heat and pressure beneath the earth's surface
An eruption composed of fine ash, gas-charged fragments of lava, and superheated steam in a cloud that travels downhill at high speed
Pelean eruption
What is a sill?
A long pluton that runs horizontally and has even width throughout
Name two things scientists can use to predict volcanoes.
Buildup of volcanic gas, rising magma temperature, rising pressure causing earthquakes
What is a pluton?
A mass of magma that has hardened underground
There are more than ____ volcanoes on earth, and about ____ of them have erupted recently
950; 500