11/4/2022 Homework #20: Marine/Ocean: Sea Floor Spreading

The youngest rocks on the ocean floor are located ____.

• near continents

• at mid-ocean ridges

• far from mid-ocean ridges

• near Asia

What technology was used during WWII to detect enemy submarines and produce the first map of the seafloor?

• Sonar
• Radar
• GPS

Process by which new ocean crust forms.

• Seafloor spreading

• Continental drift

• Mid-ocean ridge

• Rift

The OLDEST seafloor is located? 

• Closest to the mid-ocean ridge
• Farthest from the mid-ocean ridge

True or False : Sea-floor Spreading adds new material to the ocean floor?

• True
• False

At a mid-ocean ridge, melted rock rises through cracks in the _________.

• ceiling

• river

• inner core

• sea floor

As the melted rock cools and hardens,

it forms new ________.

• volcanoes

• hope

• core

• crust

In sea-floor spreading, molten material rises from the mantle and erupts

• in deep-ocean trenches

• along the edges of all the continents

• along mid-ocean ridges

• at the north and south plate

___________ is the process by which

new oceanic lithosphere (sea floor) forms as magma rises to Earth’s surface and solidifies at a mid-ocean ridge.

• Continental drift

• Sea-floor spreading

• Plate tectonics

• Mid-ocean range

What technology did scientists use in the mid-1900s to map the mid-ocean ridge?

• satellites

• deep-sea diving

• submarines

• sonar