Earth's Extreme Landscapes and Plate Tectonics

What is the deepest place on Earth?

• Mount Everest

• Victoria Falls

• The Mariana Trench

• The Grand Canyon

How deep is the Mariana Trench?

• Nearly seven miles

• Nearly three miles

• Nearly ten miles

• Nearly five miles

What happens when a continental plate and an oceanic plate crash into each other?

• The continental plate slips underneath the oceanic plate

• The oceanic plate slips underneath the continental plate

• Both plates merge together

• Both plates break apart

What is the process called when an oceanic plate is pushed down underneath a continental plate?

• Convergence

• Subduction

• Divergence

• Seafloor spreading

What are tectonic plates beneath the ocean called?

• Crustal plates

• Mantle plates

• Oceanic plates

• Continental plates

What is created at divergent boundaries between oceanic plates?

• Mid-ocean ridges

• Deep-ocean trenches

• Earthquakes

• Volcanic islands

What type of rock is found at mid-ocean ridges?

• Granite

• Limestone

• Sandstone

• Basalt

What evidence supports the process of seafloor spreading?

• Absence of igneous rocks

• Lack of volcanic activity

• Higher than normal water temperatures near mid-ocean ridges

• Presence of older rocks at mid-ocean ridges

What is the temperature of the upper parts of the mantle?

• Nearly 2,000 degrees Fahrenheit

• Nearly 1,000 degrees Fahrenheit

• Nearly 3,000 degrees Fahrenheit

• Nearly 4,000 degrees Fahrenheit

What happens to oceanic plates during subduction?

• They are absorbed back into the Earth's mantle

• They are pushed up to form mountains

• They float on the ocean surface

• They remain unchanged