Module One

Question 1

Define Oceanic Crust

Answer 1

portion of the earth that is relatively dense, contains basalt and is about 5 kilometers thick

Question 2

Define Continental Crust

Answer 2

portion of the earth that is less dense, contains granite and is 20 to 50 kilometers thick

Question 3

Define Mid-ocean ridge (trench)

Answer 3

continuous chain of underwater volcanic mountains encompassing the earth

Question 4

Define sediment

Answer 4

loose mud or sand that settles to the bottom of the ocean floor and gets thicker as you move away from the ridges

Question 5

what are magnetic anomalies?

Answer 5

when the magnetic particles are pointing south instead of north

Question 6

Plate tectonics ?

Answer 6

movement of the earth’s plates

Question 7

what’s seafloor spreading?

Answer 7

the creation of new seafloor due to the plates moving away from each other at the mid-ocean ridges

Question 8

what is subduction?

Answer 8

downward movement of a plate when another plate slides over it

Question 9

what’s a fault?

Answer 9

when 2 plates slide past one another causing an earthquake

Question 10

continental shelf

Answer 10

gently sloped shallow sect at the edge of a continent extending to the shore point to where the slope gets steeper

Question 11

continental slope

Answer 11

steeper sect of a continental edge extending seaward

Question 12

continental rise

Answer 12

gently sloping area