Plates of the Lithosphere and it's theories part 2

Question 1

Transform boundaries happens when two plates by shear force slide right past one another, which is why part of California is drifting toward Canada. What is an example of this?

Answer 1

Orchards & fences being offset

Question 2

Plate movement is initiated by:

Answer 2

convection

Question 3

What is the mechanism for plate motion?

Answer 3

Convection currents

Question 4

What are convection currents?

Answer 4

hot magma that rise toward the surface pushing plate apart.

Question 5

What is Isostasy?

Answer 5

Equilibrium between Earth’s crust & atmosphere such that the lithospheric plates “float”

Question 6

What two types of volcanoes do we get from the the subduction process caused by convergence and divergence?

Answer 6

Ocean -> Ocean (basaltic (low silica)

Ocean -> Continent (combination silica rich and silica poor.

Question 7

What are the 3 types of volcanoes?

Answer 7

Active Volcano
Dormant Volcano
Extinct Volcano

Question 8

What is an active volcano?

Answer 8

a volcano that consistently erupts

Question 9

What is a dormant volcano?

Answer 9

no evidence of recent eruption

Question 10

What is an extinct volcano?

Answer 10

a volcano that has moved off of its magma source or the magma source died

Question 11

What are the 3 factors that determine how violent a volcano’s eruption will be?

Answer 11

Composition, temperature, and dissolved gasses o the magma.

Question 12

When thinking about properties of magma, what does a volcano high in viscosity mean?

Answer 12

it is pyroplastic or high in silica, highly explosive

Question 13

What are the 3 volcanic land forms?

Answer 13

Calderas, Composite, and Lahars

Question 14

What are Calderas?

Answer 14

a magma chamber that erupts and then collapses on itself.

ex. the Cascades in Oregon

Question 15

What are composite volcanoes?

Answer 15

Most violent and explosive volcano composed of alternating layers of lava and pyroplastic.
ex. Mt, Raynier

Question 16

Pyroclastic flow is:

Answer 16

composed of hot ash, pumice, rock fragments, and gasses. High in viscosity and can flow very fast.
ex. Pompay

Question 17

A Lahar is:

Answer 17

viscous mudflow of materials such as pyroclastic debris and water. May be triggered by rapid snow melting or rainfall.

Question 18

Where is the famous “super volcano” located?

Answer 18

Yellowstone

Question 19

Indications that a volcano is going to erupt:

Answer 19

Frequent earthquakes, growing bulge due to rising magma chamber, and increased gas emissions.

Question 20

What is a shield volcano?

Answer 20

occurs in O->O and is the board, gentle sloping of magma lo in silica that is slowly coming to the surface.

Question 21

What is an example of a shield volcano?

Answer 21

Pahoenoeiha

Question 22

Where is a very unusual location that a shield volcano has been spotted?
Hint: Think outside the box

Answer 22

Mars

Question 23

What is an example of a shield volcano located on earth?

Answer 23

Mauna Loa

Question 24

What happens when a volcano like the ones in the island arc, move off of their hot spot.

Answer 24

the volcano dies and become extinct

Question 25

What happens when Lithospheric plates move across a hot spot?

Answer 25

an active volcano is produce