Any place where gas, ash, or melted rock come out of the ground.
A volcano
100
True or False? Divergent boundaries can be on the ocean floor or on land.
true
100
Volcanoes with a broad base and sloping sides. Cover a wide area and generally form from mild eruptions are?
shield volcanoes
100
_________ is the resistance of liquid to flow.
viscosity
200
When a divergent boundary is located in what part of a continent when crust stretches until a raft valley is formed.
middle of a continent
200
Melted rock
magma
200
underwater mountain ranges are also known as what?
mid-ocean ridge
200
Alternating layers of hardened lava flows pyroclastic material that create this.
Composite volcanoes
200
Many volcanoes are dormant volcanoes, meaning an eruption that has not occured in a _____ period of time.
long
300
This planet has a volcano on it.
Mars
300
opening of a volcano
vent
300
Two plates move toward each other in this boundary. Most of the time one plate sinks below the other.
convergent boundaries
300
An opening or depression at the top of a volcano caused by eruptions.
volcanic crater
300
Hot spots form over mantle ______ within a tectonic plate.
plumes
400
This is formed when thick and mostly flattened layer of cooled lava forms.
Plateau
400
A location where a column of extremely hot mantle rock, called mantle plume rises through the asthenosphere.
hot spot
400
Magma that forms at convergent boundaries have high or low concentration fluids?
high
400
When the magma chamber of a volcano empties, the roof of the magma chamber may collapse and leave an even larger basin-shaped depression which is called a ?
caldera
400
__________ volcanoes produce the most violent eruptions.
composite
500
The difference of lava and magma.
Lava is magma that reaches earths surface. Magma has not been exposed to earths surface.
500
Giant sections of lithosphere on Earth's surface.
tectonic plates
500
Vocanoes can form at a hot spot away or close to plate boundaries?
away
500
What volcano is formed when cinder or hardened lava and ash build up all around the vent and forms a steep volcano?
cinder cone
500
The Ring of Fire is a name that describe the numerous explosive volcanoes that form on convergent boundaries surrounding the _______ Ocean.