Earth Science: Chapter 9: Volcanos

An opening in the Earth's surface through which volcanic material passes is a(n)

Forms underwater in rounded lumps

Large blobs of magma that harden in the air

When the roof over a magma chamber collapses, it forms a

Lava from undersea rift zones produces volcanoes and mountain chains called

Has not erupted in recorded history

Area of deep cracks that forms between two tectonic plates that are pulling away

Pours out quickly and forms a brittle, jagged crust

Solid rock erupted from a volcano

Cool, stiff lava that does not go far from the volcano

Formed from explosive eruptions followed by quieter lava flows

Has not erupted recently, but may erupt in the future

A funnel-shaped pit around the top of a volcano's central vent is called a(n)

long cracks in Earth's crust through which lava erupts are called

The rock of Earth's mantle

Built of layers of lava released from repeated nonexplosive eruptions

Pebblelike bits of magma that harden before they hit the ground

Which of the following can happen during nonexplosive eruptions

Made of pyroclastic material usually produced from moderately explosive eruptions

The Hawaiian Islands are located

Is erupting now

Which of the following would you expect to see during an explosive volcanic eruption

Flows slowly, has a glassy surface and rounded wrinkles

Tectonic plates move away from each other at a 

The underground body of molten rock that feeds a volcano is a(n)

A big flat landform resulting from repeated nonexplosive eruptions of lava

Gases in stiff magma expand rapidly, forming glasslike slivers