Oceanic to Oceanic Destructive Plate Margins

Question 1

Stage 1

Answer 1

Convection currents in mantle cause oceanic plates to converge: Pacific Plate vs. Indo-Australian Plate (heavier)

Question 2

Stage 2

Answer 2

Tonga Trench marks point of subduction (2000km long 10.8km deep)

Question 3

Stage 3

Answer 3

Tongan islands west of plate margin and run parallel to trench

Question 4

Stage 4

Answer 4

Shallow earthquakes occur near Tonga Trench with increasing distance away as foci are deeper (Benioff zone)

Question 5

Stage 5

Answer 5

Pacific Plate is subducted 600km into asthenosphere
Melts producing magma
magma rises
Islands are a result of magma rising, breaking crust, cooling and piling up

Question 6

Draw an Ocean to Ocean Destructive Plate Margin

Answer 6

Yes