Sea Floor Spreading Wrap-Up

The deepest part of the ocean; long, narrow ditches

• Tectonic plates

• Trenches

• Divergent boundary

• Continental shelves

___________ help explain why Earth is not getting any larger even though the tectonic plates are always moving.

• earthquakes

• subduction zones

• fossils

• volcanoes

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

What did scientists use to map the oceans floor?

• Echo-location

• Sonar

• Space Shuttles

• Animals

The oceanic crust is pushed aside on both sides of the

• Continent's edge

• Deep-ocean trench

• Mid-ocean ridge

What is one piece of evidence of seafloor spreading?

• age of the rocks

• old rock pushes new rock to the side

• scientist can use sonar

What words describe M?

• deep ocean trench

• mid ocean ridge

• sea floor spreading

• subduction

What is the process happening at R?

• Deep ocean trench

• mid ocean ridge

• subduction

• sea floor spreading

At the Mid-Ocean Ridge and active volcanoes you can find:

• fault lines

• earthquakes

• older crust

• newest crust