science continental drift

What is the driving force behind continental drift and seafloor spreading?

Convection currents

Seafloor spreading steps in order starting at the mid ocean ridge and ending at the subduction zone:

Magma rises to the surface and erupts at the mid ocean ridge > new oceanic crust piles up and pushed the old crust outward > old dense crust sinks into the mantle

Statement that best describes the theory of seafloor spreading?

The creation of new crust at a mid ocean ridge and destroying of old crust at trenches

The theory that states that continents move slowly around earths surface is known as?

Continental drift

Which statements are supported by the map and which are not?

The Pacific Ocean has more young crust than the Atlantic - the Atlantic Ocean has more old crust than the Indian Ocean - old crust is located close to the continents - there is no oceanic crust older than 300 million year Pangaea

Who developed the theory of seafloor spreading?

Harry Hess

The following statements are true:

New crust is made at the oceanic ridge - old crust is destroyed by subduction - core samples tell us the age of the sea floor - old rock is more dense than the new rock

What is this landmass called?

Pangaea

The following describe Pangaea:

This continent is known as a super continent - this continent existed about 300 million years ago

What type of waves are used by sonar to map the mid ocean ridge?

Sound

What geological process is responsible for creating the ring of fire?

Subduction

Who developed the theory of continental drift?

Alfred Wegener