Vocabulary I
What is magma?
Melted rock deep inside the crust which has silica gas and water
What happens during a nonexplosive eruption?
Lava oozes and flows out most common type of eruption
What happens during a nonexplosive eruption?
Lava oozes and flows out
Where on Earth do magma and gasses from deep inside the crust pass to the surface?
Volcanoes
An instrument that measures small changes in a volcano’s slope is called?
Tiltmeter
What is lava?
Melted rock, magma, that comes out of volcano
What is lapilli?
Little pebbles (rocks) that come out of volcano
What is a shield volcano made from?
Layer of lava
What happens when magma is made with a high content of water?
Explosive eruptions with frothy lava makes pumice
When one plate slides underneath another plate is called?
Transformed boundary or subduction
What is a vent?
Opening to the surface that forms volcano
What is a pyroclastic flow?
Fast moving gasses with ash and dust
What is a cinder cone volcano made from?
Ashes (pyroclastic)
Name the 3 volcanic land forms.
Craters, calderas, lava plateaus
An instrument that measures small changes in a volcano’s slope is called?
Tiltmeter
What is a crater?
Open of the vent at top of volcano
What is blocky lava?
Cool stiff lava that form large pieces of rock. Thick doesn’t travel from the crater.
What is a volcano that forms away from a boundary and usually in the middle of a plate called?
Hot Spot- Hawaii is made this way
What is a lava plateau?
Large flat area made from lava at a rift
What are two plates that collide, and what are two plates that pull apart?
A Convergent boundary and a Divergent boundary
What is pyroclastic material?
Magma that hardens into rock before it lands: Material blasted out of volcano
Name the 3 types of volcanoes based on how they erupt.
Active- erupting or erupting soon
Dormant- can erupt but aren't right now
Extinct- Cannot erupt, gone gone!
Lava that flows from undersea rifts zones forming mountain ranges called?
Mid ocean ridges
What is a rift?
Crack or break (ditch) from a divergent boundary that has magma
Name the things scientists use to predict possible volcanic eruptions.
Earthquakes near volcano
Monitor Gasses coming out
Changes in surface tiltmeter
GPS and satellite images