Ages of Seafloor, Features at Boundaries, and Paleomagnetism

The Earth's crust/lithosphere is broken up into pieces called _______.

• Tectonic Plates
• Tectonic Pieces
• Plate Boundaries
• Crust Plates

The area around the Pacific Ocean where there are lots of earthquakes and volcanoes is called 

• Ring of Earth
• Ring of Fire
• Lord of the Rings
• Himalayan Mountains

What is the best explanation for why oceanic crust is subducted by continental crust?

• The oceanic crust is cooler than continental crust.
• Continental crust is denser than oceanic crust.
• Oceanic crust is denser than continental crust.
• The oceanic crust is hotter than continental crust.

What type of boundary formed the East African Rift Valley?

• divergent
• convergent
• transform
• adjacent

What is occurring at A?

• volcano
• mid-ocean ridge
• trench
• subduction

What type of crust is B?

• oceanic
• continental

What occurs at all types of plate boundaries?

• earthquakes
• subduction
• seafloor spreading
• volcanoes

Name the type of boundary is illustrated.

• divergent
• convergent
• transform
• subduction

The OLDEST seafloor is located? 

• Closest to the mid-ocean ridge
• Farthest from the mid-ocean ridge
• East of Hawaii
• West of California

Seafloor spreading...

• creates new crust
• destroys or recycles crust
• was discovered by Wegener.
• creates old crust