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Flashcards in Tectonics Deck (13)
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1

Describe mantle convection

Heat from inner core (created by radioactive decay) moves lower mantle
Magma rises up but cools and drops back down
Moves in circles

2

Describe subduction

Two plates move towards each other
Denser one slides under
Melts and joins the mantle

3

Describe slab pull

Plates pull apart
Hot magma forced up
Hardens and forms new crust
Cools and becomes dense
Causes plate to sink and pulled down

4

Describe sea floor spreading

Hot magma forced up and hardens to form new crust
Earths magnetic field changes direction
Lava cools
Minerals line up with magnetic field

5

Where are earthquakes found?

Clustered along plate boundaries

6

Which plate boundary is the highest magnitude earthquakes found at?

At convergent and conservative boundaries

7

Where is most at risk of earthquakes?

Pacific coast of America, Japan and SE Asian Islands

8

Where are volcanoes found?

Clustered in narrow bands

9

Which plate boundary is volcanoes found at?

Convergent

10

Where are most volcanoes located at?

The Pacific Ring of Fire

11

Where are tsunami found at?

Coastal zones at risk of earthquakes

12

Which plate boundary are tsunami found at?

Near convergent boundaries

13

Where is most at risk of tsunami?

SE Asia
West/south coast of North and South America