Plate Tectonic Evidence

Question 1

Volcanos and earthquakes cluster around

Answer 1

plate edges

Question 2

Hotspots leave tracks of extinct volcanoes as moving plates….

Answer 2

get dragged across a static plume

Question 3

Earth’s outer core generates a strong magnetic field that protects us from……

Answer 3

Radiation

Question 4

Rocks record the magnetic field

Answer 4

as they form

Question 5

Magnetism in very old rocks points toward a north pole

Answer 5

far away from today’s pole position

magnetic poles ‘wander’

Question 6

The rocks used to point in the right direction, but they drifted away from their

Answer 6

original location

Question 7

When currents in the outer core change direction, the

Answer 7

earth’s magnetic field ‘flips’

Question 8

Magnets point north during

Magnets point south during

Answer 8

normal fields

reversed fields

Question 9

Each side of the MOR grows during the same sequence of flipping fields. So they show matching

Answer 9

magnetic strips

Question 10

Analysis of ocean floor magnetism showed matching _____ on all MOR. This proved that sea-floor was _____

Answer 10

stripes

spreading

Question 11

We cause GPS satellites to

Answer 11

record plate motion