Plate tectonics
Volcanoes
Eruptions
Landforms
Magma
100
a mountain that forms in Earth's crust when molten material, or magma, reaches the surface
What is a volcano
100
two plates pull apart
What is diverge
100
area where material from deep withing Earth's mantle rises through the crust and melts to form magma
What is a hot spot
100
the hole left when a volcano collapses
What is caldera
100
Magma hardens in a volcano's pipe and the surrounding rock later wears away
What is volcanic neck
200
molten mixture of rock-forming substances, gases, and water from the mantle
What is magma
200
two plates push together
What is converging
200
The main factor that accounts for the difference between between quiet and explosive volcanic eruptions is
What is the silica content of the magma
200
tall, cone-shaped mountains in which layers of lava alternate with layers of ash.
What is composite volcanoes
200
Magma that forces itself across rock layers hardens into
What is a dike
300
When magma reaches the surface it is called
What is lava
300
Name the major belt of volcanoes
What is Ring of Fire
300
The main hazard from a quiet volcanic eruptions is
What is how the lava flows
300
When lava flows slowly building a wide, gently sloping mountain
What is shield volcano
300
Magma that squeezes between horizontal rock layers hardens to form a
What is a sill
400
After magma and lava cool, they form
What is solid rock
400
Volcanoes form along the
What is mid ocean ridges
400
A pyroclastic flow typically occurs during a
What is explosive eruption
400
When ash, cinders, and bombs build up in a steep pile around a volcano's vent, the result is
What is cinder cone volcano
400
a mass of rock formed when a large body of magma cools inside the crust
What is batholith
500
Volcanic belts form along the boundaries of Earth's
What is plates
500
Volcanoes sometimes create a string of islands called an
What is an island arc
500
When magma hardens in a volcano's pipe, it is
What is volcanic neck
500
Sometimes magma cools and hardens into rock before reaching the surface. Over time, forces such as flowing water, ice or wind may strip away the
What is layers above the hardened magma and expose it.
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