L6 : SEAFLOOR SPREADING

Question 1

A device that bounces sound waves off underwater objects and then record the echoes of these sound waves is called?

Answer 1

SONAR

Question 2

an American geologist and a United States Navy officer in World War II who is considered one of the “founding fathers” of the unifying theory of plate tectonics. He is best known for his theories on sea floor spreading,

Answer 2

Harry Hammond Hess

Question 3

The magma moves up from the mantle and erupts as pillow lava is named as

Answer 3

Seafloor Spreading

Question 4

3 EVIDENCES

Answer 4

evidence from :
molten materials
magnetic strips
drilling sample

Question 5

EVIDENCE FROM :

rocks shaped like pillows (rock pillows) show that molten materials have erupted again and again from cracks along the mid-ocean ridge and cooled quickly.

Answer 5

molten materials

Question 6

EVIDENCE FROM :

rocks that make up the ocean floor lie in a pattern of magnetized stripes which hold a record of the reversals in magnetic field; and

Answer 6

magnetic strips

Question 7

EVIDENCE FROM :

core samples from the ocean floor show that older rocks are found farther from the ridge; youngest rocks are in the mid- ocean ridge

Answer 7

drilling sample