Vocabulary
Magma that flows onto the earth's surface
lava
This is the main product of a nonexplosive eruption.
Lava
True or false: Volcanic eruptions have little effect on the Earth
false
True or False: Magma is often a mixture of liquid and solid mineral crystals.
True
a funnel-shaped pit around the central vent of a volcano
crater
True/False: Pillow lava's round shape is caused by contact with water.
True
What consistency does an ash flow become when it mixes with water?
Like wet cement
The rock of the Earth's mantle is NOT (liquid, hot, under pressure)
liquid
a place on earth's surface that is directly above a column of rising magma called a mantle plume
hot spot
The main product of an explosive eruption.
Pyroclastic material
Ash fallout can causes floods by damming up _______
river valleys
Volcanoes begin to form in the deeper regions of the _____
crust
fragments of rock that are created by explosive volcanic eruptions
pyroclastic material
Pebble-like bits of magma that cool in the air
Lapilli
When the roof over an empty magma chamber collapses, it forms a ______
caldera
True or False: Active volcanoes include only the ones currently erupting
False
a mountain that forms when molten rock, called magma, is forced to the earth's surface
volcano
Volcanic eruptions can be __________ times stronger than the explosion produced by the first atom bomb.
10,000
This kind of volcano forms from alternating layers of pyroclastic material and lava
composite volcano
_____ volcanoes have erupted in recorded history but are not erupting now.
Dormant