Show:
Volcanism
Major Volcanic Zones
Mid-Ocean Ridges
Hot Spots
Review
100
Volcanism is related to which force of nature?
What are volcanoes/volcanic eruptions
100
Most active volcanoes are located near which two kinds of boundaries?
What are divergent and convergent
100
Where does the greatest amount of magma come to the surface?
What is at mid-ocean ridges
100
Areas of volcanism that form within lithospheric plates are called?
What are hot spots
100
The man behind the theory of continental drift.
Who is Alfred Wegener
200
Any activity that includes the movement of magma toward or onto the surface of the earth.
What is volcanism
200
Many volcanoes are located near this type of zone, where one plate is forced under the other plate toward the hot asthenosphere.
What are subduction zones
200
Why do most volcanic eruptions along the mid-ocean ridges go unnoticed?
What is they happen to deep for us to see
200
Describe the motion of a hot spot under the surface of the Earth.
What is hot spots appear to remain stationary
200
When two plate boundaries move away from each other.
What are divergent boundaries
300
Most magma forms where within the Earth?
What is at plate boundaries
300
If an oceanic and continental crust collide, which type of crust is forced under the other?
What is oceanic
300
Long narrow cracks in the surface of the Earth where magma forces its way to the surface.
What are rifts
300
Why might a hot spot volcano cease to erupt?
What is the magma chamber and the volcano do not align any more
300
When two plate boundaries grind past each other side by side.
What is transform fault boundary
400
Magma that erupts onto the Earth's surface.
What is lava
400
Why is the oceanic crust at a subduction zone forced under the continental crust?
What is it's more dense
400
Cracks that form above ground, where lava flows to the surface.
What are fissures
400
What example does the book give for a chain of volcanic hot spots?
What are the Hawaiian Islands
400
When weight is added or taken away from the crust, it tries to reach a balance called ___________. (Page 83)
What is isostasy
500
What happens to temperature and pressure as the depth beneath the Earth's surface increases?
What is both increase
500
What is the name of the most active volcanic region in the world called? It is located in the Pacific ocean.
What is the Pacific Ring of Fire
500
Which landmass most notably has a fissure almost perfectly dividing it between two plates?
What is Iceland
500
Many extinct mountains are located close to a hot spot, why might this be?
What is the movement of the crust is carrying the mountains away from the hot spot
500
The three major types of stress we learned about in class are _________, __________, and ___________. Think marshmallows.
What are compression, tension, and shearing