EQ1 Key terms (1.1-1.3)

Question 1

Define Asthenosphere

Answer 1

The partially molten part of the mantle on which Earth’s tectonic plates lie.

Question 2

Define Convection

Answer 2

The movement of mantle material in cells when heated by radiation from the Earth’s core.

Question 3

Define Lithosphere

Answer 3

The rigid, outermost layer of the Earth from which tectonic plates are formed. It is made up of the crust and upper mantle.

Question 4

Define Sea floor spreading

Answer 4

The movement of oceanic crust away from a constructive plate boundary, as recorded by the magnetic stripes in the basaltic rock.

Question 5

Define Slab Pull

Answer 5

At a subduction zone the descending part of the oceanic plate pulls the rest of the plate with it.

Question 6

Define Subduction

Answer 6

The melting of an oceanic plate as it descends into the mantle at a convergent (destructive) boundary.