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20 questions
Magma becomes lava when it reaches a volcano's ______.
Vent
Crater
Chamber
Mantle
Lava that forms creases and loops when it hardens is called _________.
A'a
Pahoehoe
Silica
Lahar
In a volcano, magma collects in a packet called ________.
Magma flow
Magma chamber
Magma pipe
Hot spot
A string of volcanic islands called __________ can be formed along a trench.
A boundary plate
An island arc
A hot spot
An old denser plate
Is the process by which an ocean floor sinks beneath an ocean trench and into the mantle.
Subduction
Hot spot
Caldera
Volcanism
A ______ is a duct connecting the magma chamber and the outside of the volcano.
Vent
Crater
Lava flow
Volcanic cone
Refers to the movement of lava as it flows out from the vent.
Lava flow
Magma flow
Pahoehoe
A'a
An opening on the Earth's crust through which hot molten rock flows out from deep inside the Earth.
Volcano
Fault line
Fold
Crater
Comprises the many volcanoes that rim the Pacific Ocean
Ring of Fire
Mid-Atlantic Ridge
Eurasian-Melanesian Mountain Belt
Pacific Rim
Are long, underwater mountain ranges that sometimes have rift valleys down their centers.
Ridges
Oceanic Plate
Trench
Subduction Zone
Is a deep valley along a spreading boundary.
Rift Valley
Ridges
Subduction zone
Trench
A volcano that had its last eruption more than 10,000 years ago.
Extinct Volcano
Sleeping Volcano
Active Volcano
Quiet Volcano
Is a substance formed by the chemical combination of oxygen and silicon atoms.
Silica
Silica Oxide
Silica Acid
Magma
Takes place when the gas bubbles within magma are gently dissipated to the surface, causing the magma to flow very easily.
Quiet eruptions
Explosive eruptions
Pahoehoe
A's
It happens when think and viscous lava clogs the vent, preventing gases from escaping, causing pressure to build up.
Quiet explosions
Explosive explosions
Pyroclastic flow
Lahar
Fragments that are about as small as grains of sand.
Volcanic ash
Cinders
Bombs
Lava
Lava fragments that are like pebbles in size are called ______.
Volcanic ash
Cinders
Bomb
Lahar
Large lava fragments that are like baseball in size.
Volcanic ash
Cinders
Bombs
A'a
It forms when rain falls and dilutes the pyroclastic lava.
Pyroclastic flow
Lahar
Lava
Bombs
In what year did Mount Pinatubo in Zambales erupted violently, causing the death of many people.
June 1991
June 1919
July 1991
July 1919
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