Vocabulary
The Formation of Magma
Where Volcanoes Form
When Tectonic Plates Seperate
Hot Spots & Predicting Volcanic Eruptions
100
A volcanically active area of Earth's surface far from a tectonic plate boundary
What is Hot Spot?
100
Where does magma form?
In the depersonalize regions of the Earth's crust and the uppermost mantle.
100
The common area around the Pacific Ocean that is full of active volcanoes.
What is the Ring of Fire?
100
What is the name for the boundary where tectonic plates separate?
What is divergent plate boundary?
100
Tectonic plates collide at a/an ___________ boundary.
What is convergent.
200
What is a Rift Zone?
An area of deep cracks that forms between two tectonic plates that are pulling away from each other
200
This force allows the the melted rock to remain in a putty like state.
What is pressure.
200
What total percent of volcanoes form at plate boundaries?
95%. 80% at colliding plates and 15% at separating plates.
200
True or False: Iceland was formed by lava.
What is True? Iceland was forme by the Mid-Atlantic Ridge.
200
Define hot spot.
A volcanically active area of Earth's surface far from a tectonic plate boundary.
300
An area around the Pacific Ocean full of active volcanoes.
What is th Rimg of Fire?
300
What is the most common reason magma forms?
A decrease in pressure.
300
True or false: A large number of volcanoes lie directly on tectonic plate boundaries.
What is True?
300
Since magma rises, is it (less dense, more dense, equally as dense) as the sourrounding rock, causing it to rise through the rifts.
What is less dense.
300
What are the three types of volcanoes?
What is extinct, dormant, and active.
400
Built of layers of lava released from non explosive volcanoes.
What is Shield Volcanoes?
400
What allows magma to form where it does?
The high pressure and temperatures.
400
What are tectonic plate boundaries? List the three types.
What is convergent, where two plates collide; divergent, where two plates pull away; transform or strike-slip, where two plates slide past each other.
400
True or False: Most volcanic occurs away from from mid-Ocean ridges.
What is False? Most volcanic activity occurs at mid-Ocean ridges.
400
True or false: A tiltometer is used to detect small changes in a volcanoe's slope.
What is True?
500
Define Stratovolcanoes.
Form from explosive eruptions of pyroclastic material followed by quieter flows of lava.
500
What two forces cause magma to form?
Pressure and temperature.
500
True or false: Th Ring of Fire spans on three continents.
What is False? It spans on four continents: North America, South America, Asia, Australia.
500
What is the deep set of cracks that forms between plates called?
What is Rift Zone.
500
How are satellite images used to predict volcanoes?
They are used to detect surface temperature changes and gas emissions from a volcanoe over time.
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