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Volcanoes
volcanoes (2)
volcanic eruptions
formation of magma
types of volcanoes
100
movement of magma toward or onto the surface of the Earth.
What is volcanism.
100
the year of the eruption of Mt. Katmai in Alaska
What is 1912
100
lava pours out quickly and forms brittle crust.
What is Aa
100
dark colored, rich in magnesium and iron. Forms most of the oceanic crust
What is mafic
100
Build from layers of lava released from nonexplosive eruptions over and over again.
What is shield
200
liquid rock on the surface of the Earth's crust
What is lava
200
divergent boundary, greatest amount of magma produced here
What is mid-ocean ridge
200
lava flows slowly, forms glassy wrinkly surfaces
What is Pahoehoe
200
large blobs of magma that hardens in the air
What is volcanic bombs
200
made from pyroclastic material Forms steep slopes Short eruptions Small volcanoes Form in clusters next to other volcanoes Erodes easily
What is cinder cones
300
formed at plate boundaries, liquid rock beneath the earth's surface
What is magma
300
surface of the crust away from the plates, formed from cracks too
What is hot spot
300
forms underwater, round lumps
What is pillow
300
largest pieces of solid rock from the volcano
What is volcanic blocks
300
have not erupted in recorded history
What is extinct volcanoes
400
part of the volcano that allows the magma to reach the earth's surface
What is vent
400
convergent boundary, magma rises to form a volcano
What is subduction zone
400
cool, stiff lava, oozes, forms heaps of sharp edged chunks.
What is blocky.
400
little stones are pieces of magma that harden in the air
What is Lapilli
400
currently not erupting but may erupt again.
What is dormant volcanoes
500
plate boundaries, Ring of Fire, and where plates collide.
What is where volcanoes form
500
rock melts when temp increases and press. increases.
What is formation of magma
500
silica rich, lighter in color, more common in the continental crust.
What is felsic.
500
walls of gas bubbles from the magma explode into tiny slivers.
What is volcanic ash.
500
currently erupting or show signs of future eruption.
What is active volcanoes