Where Are Volcanoes Found?
Most of Earth's volcanoes are found along _________ ______________.
Plate Boundaries
Once magma reaches the surface it's called...
lava
What stage is a volcano that is "sleeping," but could become active in the future?
dormant
Bodies of hardened magma that are pushed upward are called:
Dome mountains
Ex: Stone Mountain in Atlanta, Georgia
The wide, gentle sloping volcano formed by thin layers of lava is called:
Shield Volcano
3 general locations of volcanoes:
1. Divergent boundaries
2. Convergent boundaries
3. Hot spots
High silica = ____________ eruption
Low silica = _____________ eruption
High silica = EXPLOSIVE eruption (thick magma)
Low silica = QUIET eruption (thin magma)
Bowl shaped area that forms at the top of a volcano.
Crater
Created when an explosive eruption causes the crater of the volcano to collapse and form a large hole.
Caldera
Ex: Crater Lake
Mt. St Helens is an example of a ___ volcano. It has alternating lava flow (quieter) and ash/cinders/bombs (explosive eruptions).
Composite Volcano
What is a hot spot?
Random magma chamber
Area where material from deep in Earth's mantle rises to the crust and melts to form magma
What force pushes magma to Earth's surface?
Expanding gases
3 stages of volcanic activity
Active
Dormant
Extinct
How are lava plateaus formed?
Thin lava from fissures, cool and build up tall, flat layers over millions of years.
The steep volcano formed from volcanic solid pieces (ash, cinders, bombs). It always has explosive eruptions. Paricutin in Mexico is an example.
Cinder Cone Volcano
Name the 2 popular hot spots in our country.
1. Hawaii
2. Yellowstone
What process is happening because the Juan de Fuca Plate is meeting the N.A. Plate at a convergent boundary?
Subduction
What stage of activity is a volcano that is currently erupting?
active
Name the 3 types of volcanoes, formed from hardened lava and give an example of each.
1. Cinder Cone- Paricutin in Mexico
2. Composite- Mt. St. Helen's in WA
- Mt. Fuji in Japan
- Mt. Vesuvius in Italy
3. Shield- Kilauea in Hawaii
Name the area in our country that volcanoes form from converging plates.
Pacific Northwest
Name the 4 pieces of data scientists collect to warn of an upcoming eruption?
1. Changes is elevation
2. Gases escaping
3. Small EQs from magma moving
4. Rising groundwater temps bc magma is near surface
Describe the magma chamber
Part of a volcano miles deep in the upper mantle that stores pockets of magma.