Destructive Plate Margins

Question 1

In an (O/C) destructive, which plate is subducted? Why?

Answer 1

Oceanic - it is denser

Question 2

The subducted plate experiences increased ? and ?

Answer 2

Heat and pressure

Question 3

What releases water into the asthenosphere?

Answer 3

Metamorphism

Question 4

What does the water do in the asthenosphere?

Answer 4

Lowers the melting point

Question 5

What is created and moves upwards?

Answer 5

Partial melt

Question 6

What happens to partial melt?

Answer 6

It cools and solidifies on the ocean floor and builds up until it breaks through the ocean surface

Question 7

What is the area where earthquakes occur called?

Answer 7

Wadati-Benioff zone

Question 8

Is there volcanism at destructive plate boundaries?

Answer 8

Yes

Question 9

Are there earthquakes at destructive plates?

Answer 9

Yes

Question 10

What is the feature that is seen on surface as a depression called? Give an example?

Answer 10

Ocean trench
Peru-chile

Question 11

What kind of melting is experienced at a destructive margin?

Answer 11

Hydration

Question 12

Which plate will subduct at an (O/O) boundary?

Answer 12

The denser, older, cooler oceanic plate

Question 13

Plate is moved by ? And ?

Answer 13

Slab pull and convection currents

Question 14

How are island arcs created? Does this happen at (O/C) or (O/O)

Answer 14

Normal destructive but it happens along the length of plate boundary - O/O

Question 15

Why is seismic activity experienced at a destructive plate?

Answer 15

As the plate is being subducted, it will stick to other plate, friction builds, pressure exceeds friction