Volcanoes and Plate Tectonics
Volcanoes and Plate tectonics pt 2
Volcanic Eruptions
Volcanic Eruptions pt 2
Misc.
100
What is volcanism?
Any activity that includes the movement of magma toward or onto the surface of the Earth.
100
What is an island arc?
A band of volcanic islands formed in the ocean.
100
How many general types of lava are there?
3
100
When felsic lava explodes, it throws _________ in the air.
tephra
100
This type of lava can be as big as a house.
Volcanic Block
200
Magma that erupts on to the Earth's surface is called?
Lava
200
Cracks through which lava flows are called? (many found in iceland)
Fissures
200
Name one of the 3 types of lava?
Mafic, Felsic, Pahoehoe
200
Tephra particles less that 2mm make up what?
Volcanic Ash
200
Volcanic cones that are broad at the base and have gently sloping sides are called?
Shield cones
300
The opening through which the molten rock flows onto the surface is called a __________?
Vent
300
What are the areas called when volcanoes form in the middle of lithospheric plates?
Hot Spots
300
Rapid cooling on the surface of a lava flow can form chunks of solidified lava, while the lower area continues to flow. These chunks are called?
aa
300
Tephra particles less than 0.25 mm in diameter is called?
Volcanic dust
300
Most explosive eruptions form _________ cones.
Cinder Cones
400
Many volcanoes are found around what type of zone?
Subduction
400
When one lithospheric plate is forced underneath another, this is called ________.
Subduction
400
When lava flows out of fissures on the ocean floor then rapidly cools forming round shapes, it is called?
Pillow Lava
400
Large tephra particles less than 64mm in diameter is called?
Lapilli
400
A large basin shaped depression is called a _________.
Caldera
500
This is a major zone of active volcanoes that circles the pacific ocean.
Ring of Fire
500
What is the mid-Atlantic ridge?
A point in the Atlantic ocean where plates are moving apart from each other and causing a ridge.
500
Pillow lava is commonly found along?
Mid ocean ridges
500
How many types of cones are there?
3
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