Seafloor Spreading (Chapter 17 Section 2)

What is a device that can detect small changes in magnetic fields generated by ocean floor rocks?

• Magnetometer

• Sonar

• Radar

• Landsat Satellite

What is the theory that explains how new ocean crust is formed at ocean ridges and destroyed at deep-sea trenches?

• Continental Drift

• Seafloor Spreading

• Plate Tectonics

What does topography describe?

• The elevations and features of a surface

• The geologic make-up of a surface

• The distribution, arrangement, and type of rocks in an area

What does the topography of the ocean floor consist of?

• Ocean Ridges

• Deep Sea Trenches

• Rift Valleys

• Volcanic Mountain Ranges

Where is new ocean crust created?

• Ocean Ridges

• Deep Sea Trenches

Where is ocean crust destroyed?

• Ocean Ridges

• Deep Sea Trenches

Rock samples taken near ocean ridges are _______ than rock samples taken near deep sea trenches

• older

• newer

Rock samples taken near deep sea trenches are _______ than rock samples taken near ocean ridges

• older

• newer

What are underwater mountain chains?

• Ocean Ridges

• Deep Sea Trenches

• Rift Valleys

• Volcanic Mountain Ranges

What are long, narrow depressions of seabed?

• Ocean Ridges

• Deep Sea Trenches

• Rift Valleys

• Volcanic Mountain Ranges