1.4 Flashcards

1
Q

What is paleomagnetism?

A
  • lava contains magnetic minerals
  • while lava cools, minerals align with magnetic field
  • reverses direction every 200,000 years
  • direction of mineral deposition also reverses
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2
Q

What can be observed due to paleomagnetism?

A
  • Symmetrical patterns either side of a mid ocean ridge can be observed as rock moves away from mid ocean ridge.
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3
Q

What is the asthenosphere?

A
  • Layer between crust and mantle
  • Formed of semi molten rocks
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4
Q

What is slab pull?

A

The side of the plate at the subduction zone is pulled under the other plate

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5
Q

What is sea floor spread?

A

Lava continuously rises to surface
Cools and forms new rock on edges of plate

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6
Q

At what type of plate boundary does sea floor spread occur?

A

Constructive

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7
Q

What is magma?

A

Partially molten mantle rock

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8
Q

What is ridge push?

A

Mid ocean ridge gets heavy
Slides downwards in opposite directions

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