Show:
Volcanoes and Plate Tectonics
Properties of Magma
Volcanic Eruptions
Volcanic Landforms
Vocabulary Words
100
True or False, you can often find volcanoes and earthquakes happening near the same places?
True
100
What is viscosity?
Viscosity is a liquid's resistance to flowing.
100
This is the bowl-shaped area that may form at the top of a volcano around the central vent, where most of the magma escapes.
What is the crater?
100
What causes a hot spring?
geothermal activity
100
Hot, molten rock inside the earth is called ________.
Magma
200
Volcanoes often occur along _____ boundaries.
What are plate boundaries?
200
Compare a fluid with high viscosity to a fluid with low viscosity.
A fluid with high viscosity does not flow freely, it is very sticky. A fluid with low viscosity flows freely.
200
What causes the magma to erupt through the vents?
Pressure from the gasses dissolved in the magma forces the magma up through the pipe.
200
What are the three ways volcanic landforms can be formed?
1. from lava and ash (eruption) 2. from magma 3. geothermal activity
200
The part of a volcano where magma is stored is the ______________________.
Magma chamber.
300
Hawaii is an example of a(n) ___________ which is a group of islands formed by volcanoes along a deep ocean trench.
What is an island arc?
300
Silica is an example of a chemical ________________ that can be found in magma.
Compound
300
What are the two types of volcanic eruptions?
Quiet and Explosive eruptions.
300
Which of these is NOT formed from ash and lava: cinder cone volcano, lava plateau, caldera, composite volcano?
Caldera
300
Is viscosity a physical property or chemical property, why?
Physical property because it can be observed without performing a chemical reaction.
400
This is the name of the volcano belt around the Pacific ocean.
What is the Ring of Fire?
400
What can affect magma's viscosity?
Amount of silica and temperature.
400
What is the difference between a dormant and an extinct volcano?
A dormant volcano may erupt in the future, an extinct volcano most likely will not erupt again in the future.
400
What is a difference between a shield volcano and a cinder cone volcano?
Shield volcanoes are mostly flat and formed from gradually flowing lava, cinder cone volcanoes are steeper and formed by explosive eruptions.
400
What does geothermal mean?
geo = earth, thermal = heat. It has to do with heat from inside the earth, due to magma or hot rocks.
500
Describe how a volcano is formed (generally). Make sure you relate volcanoes to plate tectonics.
Volcanoes form above a hot spot when magma erupts through the crust and reaches the surface. This often happens along plate boundaries.
500
You come across lava formed from magma with a high silica content and low temperature, describe its viscosity.
High viscosity.
500
This is an explosive eruption with hot gases, ash, cinders, and bombs.
What is a pyroclastic flow?
500
Why are soils from lava and ash so fertile?
They have elements that plants need.
500
What is a batholith?
A large mass of rock formed when a body of magma cools inside the crust.