Deformation Chapter Quizizz

Approximately how much of Earth’s surface is below sea level?

• 10 percent

• 30 percent

• 70 percent

• 90 percent

Approximately how much of Earth’s surface is above sea level?

• 10 percent

• 30 percent

• 70 percent

• 90 percent

Oceanic crust is made of

• basalt and is denser than continental crust.

• granite and is denser than continental crust.

• basalt and is less dense than continental crust.

• granite and is less dense than continental crust.

Isostasy is a condition of ________________________ between the mass of Earth's crust and the buoyancy of the mantle.

• equilibrium

• imbalance

• instability

• disproportion

Topographic highs in the crust have deep ________________________ that extend into the mantle and provide buoyant support.

• roots

• valleys

• ridges

• trenches

Continents are said to float on the denser ________________________.

• mantle

• crust

• core

• atmosphere

As ________________________ rise, deep roots form.

• mountains

• rivers

• trees

• buildings

As mountains are eroded, their roots become ________________________.

• smaller

• larger

• unchanged

• more visible

As material is removed from mountains by erosion, the crust slowly rises. This process is known as ________________________.

• isostatic rebound

• plate tectonics

• subduction

• orogeny

Such crustal movements resulting from isostasy are not restricted to continents, but also occur when volcanic mountains on the seafloor, called ________________________, form.

• seamounts

• plateaus

• trenches

• ridges