Earth's Layers/Plate Tectonic Quiz

What is the Earth's crust like?

• uniform and thick

• consistes mostly of iron and nickel

• floats above a layer of hot magma

• higher density than the core

What is the crust composed of?

• silicon and oxygen

• iron and nickel

• iron and magnesium

What is the mantle composed of?

• iron and magnesium

• iron and nickel

• silicon and oxygen

Which layer of Earth is described as "plastic and flowing"

• troposphere

• asthenosphere

• atmosphere

• lithosphere

The theory of plate tectonics says:

• Transform boundaries form when two lithospheric plates collide

• Lithosphereic plates move because the inner core of Earth is liquid

• Continents drift because they rest on lithospheric plates that move

• Lithospheric plates are destroyed at the mid-ocean ridges

The depth within the Earth's interior increases as

• The density, temperature and pressure of Earth's interior increases

• The density, temperature and pressure of Earth's interior decreases

• The density and temperature of Earth's interior increases, and the pressure decreases

The primary rock composition of Earth's oceanic crust is

• granite

• shale

• basalt

• sandstone

Lithospheric plates move and drift the continents because

• Convection currents within the lithospheric plates cause the plates to float on top of the asthenosphere

• Convection currents cause the asthenosphere to be plastic and flowing which moves the plates that sit on top

• The continents move due to the plastic, flowing composition of the lithospheric plates upon which the continents sit.

Which statement best explains how Earth's layers formed?

• More dense material sank, and less dense material rose toward the top.

• Less dense material sank, and more dense material rose to the top

• Cooler, more dense material rose to the top forming the crust.

The plates move at a rate of about

• 1 to 10 meters per year

• 1 to 10 millimeters per year

• 1 to 10 kilometers per year

• 1 to 10 centimeters per year