Volcano Formation
Magma that has reached the Earth’s surface is called this
What is lava?
True or False basalt is heavier than granite?
What is True?
Light porous rock filled with holes that once held trapped gasses. (small of these rocks can float)
What is pumice?
A volcano that is actively erupting is called this.
What is an alive volcano?
The name given to magma that forms over porous region of rocks.
What is Magma Chambers?
A circular depression. This usually forms around the vents of a volcano.
What is a crater?
This is the rim of the Pacific Ocean is so famous for its volcanoes.
What is the Ring of Fire?
These are the 2 main ingredients of lava.
What is silicate and gas?
This is hardened magma that plugs the volcano’s center
What is a volcanic plug?
This is used to measure the temperature of volcanoes.
What is thermal imaging?
The percent of volcanoes that form over subduction zones?
What is 80%?
Volcanic islands are often part of a group that commonly form this shape.
What is an arc?
Long horizontal pluton are called this.
What are sills?
Eruptions are classified into six different types according to what.
What is the explosiveness of the volcano.
This event can precede a volcanic eruption.
What is an earthquake?
This is the two ways volcanoes grow.
What is either by intrusion or extrusion?
This is why more volcanoes form around the pacific ocean than the atlantic ocean.
What is the Pacific plate has numerous subduction zones? (Atlantic has divergent plate, which allows new magma to flow in)
This created by a volcano does not dissolve in water, is as abrasive as crushed glass, and can obscure the sunlight.
What is volcanic ash?
Caldera different from a crater differ in these ways.
What is a caldera is larger than a crater and results from magma erupting or withdrawing from the chamber. A crater is smaller and is formed during an eruption when the plug or overlying layer either collapses or becomes part of the pyroclastic flow.
These are two benefits of volcanic eruptions.
What is fertile soil, building materials, hand soaps and cleaner, diamonds are brought to the surface, release of trapped atmospheric gasses, or gives scientist visible information about the inside of the Earth.
These are the 3 ways volcanoes can form.
What is over hot spots, subduction zones, and at divergent boundaries?
Volcanoes formed from oceanic-oceanic plate collisions the most violent for this reason.
What is because magma in these volcanoes contain dissolved water and carbon dioxide and the gasses are released in very explosive eruptions?
What is the difference between a volcanic block and a volcanic bomb?
A block leaves the volcano as solid rock and a bomb leaves the volcano as molten rock.
The three categories of volcanoes.
What are active, dormant and extinct
3 ways volcanologists monitor or predict a volcanic eruption are...
What are changes in gasses, changes in temperature of the volcano and nearby streams, and change in the ground size/shape