A device that bounces sound waves off underwater objects is called
Sonar
Magnetic stripes
Subduction
A compass
The process that continually adds new material to the ocean floor is called
Sea-floor spreading
Convection currents
Continental divide
A canyon on the ocean floor at which the crust bends downward is called a(n)
Deep ocean trench
Mid ocean ridge
Continent
Magnetic stripe
The process by which the ocean floor sinks into the mantle is known as
Deep ocean trenchs
Mid ocean ridges
A chain of underwater mountains along which sea-floor spreading occurs is a(n)
Volcano
Deep ocean tench
Drilled rock sample