w4

Question 1

a device that bounces sound
waves off underwater
objects and then record the
echoes of these sound
waves

Answer 1

sonar

Question 2

attached to ships scientists
discovered a lot about the magnetic properties of the seafloor.

Answer 2

magnetometers

Question 3

explained how the convection currents in the Earth’s interior make the seafloor spread.

Answer 3

harry hess

Question 3

ensures that the “recycled” materials
formed in the lithosphere were back to the mantle. In this
recycling process which was later named as seafloor
spreading the magma moves up from the mantle and
erupts as pillow lava.

Answer 3

convection current