VOlcanoes
eruptions
Nonexplosive eruptions and Explosive Eruptions are two types of eruptions.
Nonexplosive: This is the most common type of eruption. They can release a lot of lava.
Explosive: They are much rarer than nonexplosive eruption. Explosive eruptions can be very damaging. clouds of hot debris, ash, and gas rapidly shoot out of the volcano during an explosive eruption.
(Holt Science & Technology: Earth Science pg.250-251)
Nonexplosive: This is the most common type of eruption. They can release a lot of lava.
Explosive: They are much rarer than nonexplosive eruption. Explosive eruptions can be very damaging. clouds of hot debris, ash, and gas rapidly shoot out of the volcano during an explosive eruption.
(Holt Science & Technology: Earth Science pg.250-251)
Parts of a volcano
Types of lava
•Aa-pours out quickly and forms a crust. The crus is torn into pieces as molten lava continues to flow beneath.
•Pahoehoe-flows slowly. Its surface has wrinkles.
•Pillow lava- forms when lava erupts under water. This lava forms lumps that are in the shape of pillows.
•Blocky lava- cool, stiff lava that does not travel far from the erupting vent. It usually comes out of the volcano and becomes heaps of sharp-edged chunks. (Holt Science & Technology: Earth Science pg.253)
•Pahoehoe-flows slowly. Its surface has wrinkles.
•Pillow lava- forms when lava erupts under water. This lava forms lumps that are in the shape of pillows.
•Blocky lava- cool, stiff lava that does not travel far from the erupting vent. It usually comes out of the volcano and becomes heaps of sharp-edged chunks. (Holt Science & Technology: Earth Science pg.253)
Types of pyroclastic material
•Volcanic bombs-large blobs of magma that harden in the air. The shape was caused by the magma spinning through the air as it cooled.
•Lapilli- pebble like bits of magma that hardened before they hit the ground.
•Volcanic ash-forms when the gases in stiff magma expand rapidly and the walls of the gas bubbles explode into tiny, glasslike slivers.
•Volcanic blocks-largest pieces of pyroclastic material. They are pieces of solid rock erupted from a volcano.
(Holt Science & Technology: Earth Science pg.254)
•Lapilli- pebble like bits of magma that hardened before they hit the ground.
•Volcanic ash-forms when the gases in stiff magma expand rapidly and the walls of the gas bubbles explode into tiny, glasslike slivers.
•Volcanic blocks-largest pieces of pyroclastic material. They are pieces of solid rock erupted from a volcano.
(Holt Science & Technology: Earth Science pg.254)
3 types of volcanoes
Composite volcano
CINDER CONE volcano
Volcanic landforms
A crater is a funnel-shaped pit around the central vent at the top of many volcanos.
A caldera is a big depression that forms when the magma chamber empties a little and the roof collapses.
A lava plateau is a landform that results from repeated eruptions of lava spread over a large area.
(Holt Science & Technology: Earth Science pg.258-259)
A caldera is a big depression that forms when the magma chamber empties a little and the roof collapses.
A lava plateau is a landform that results from repeated eruptions of lava spread over a large area.
(Holt Science & Technology: Earth Science pg.258-259)
Where volcanoes form
Volcanoes form at the Ring of Fire. The Ring of fire is the area where a lot of volcanoes are located. (Holt Science & Technology: Earth Science pg.261)