Volcanic material
what is volcanic ash
hard and does not dissolve in water;it is as sharp as crushed glass
What are volcanologists
People who study volcanoes
pumice
Pumice s a lightweight porous rock.
Extinct Volcano
Extinct Volcano A volcano that can no longer erupt
Where do most volcanoes form.
Most volcanoes form at the boundries between tectonic plates.
Types of pyroclasts
Ash, Lapilli, and Block
Mid-Atlantic Ridge Volcano
A volcanic mountain range that rises from the Atlantic abyssal plain
hot spot
A place on the earth's surface that is directly above a column of rising magma
Dormant volcano
A volcano that has not erupted in a long time but may erupt again
whats the difference between magma and lava
magma is the melted rock between the earth's surface. lava is the magma that has reached the earth's surface
What is a bulging volcano
As a mass of new lava rises to the surface, it pushes the old rock aside and upward making a bulge or uplift on the surface.
how do volcanoes grow
By intrusion and extrusion
plug
A structure of hardened magma that forms inside a vent.
Active volcano
Active volcano Volcanoes that have erupted recently or will erupt soon
The most common type of volcano
A cinder-cone volcano
how are volcanoes important to creation
they provide nutrients and very good fertile soil for crops
How do volcanoes form at divergent boundries
plates moving away from each other and magma rising through the gaps
caldera
A volcanic crater that is grater than 2 km in diameter and is formed by the collapse of surface rock into an empty magma chamber
Alive volcano
Alive volcano A volcano that is currently erupting
What are the types of plate collisions
oceanic-oceanic, oceanic-continental, continental-continental
What Is the difference between pahoehoe lava and aa lava.
Pahoehoe is lava that has a smooth surface and flows easly. Aa lava has a rough surface that carries rough rock and cooled lava fragments as it flows.
how can volcanoes form at subduction zones
by magma getting through the cracks
pluton
a body of magma that has hardened underground
Shield volcano
Shield volcano A gently sloped volcano built almost entirely of lava flows
what is the ring of fire
subduction zones bordering the Pacific plate, cocos plate, and the Nazca plate