Earth's Layer

The interior of Earth is made up of several physically different layers. The solid layer of Earth that moves over a viscous layer is called the

• core.
• crust.
• asthenosphere.
• atmosphere.
  

Which of these correctly lists Earth’s layers in order from the center to the surface?

• outer core, inner core, asthenosphere, lithosphere
• asthenosphere, lithosphere, outer core, inner core
• inner core, asthenosphere, lithosphere, outer core
• inner core, outer core, asthenosphere, lithosphere

The continental crust floats on top of the mantle because the crust is

• less dense than the mantle.
• made of a liquid material.
• made up of oxygen which is a light element.
• separated from the mantle by a layer of water.
  

A student uses clay to build models of an ocean plate and a continental plate. What characteristic cannot be accurately represented by the models?

• the shapes of plates
• the relative sizes of plates
• the relative densities of plates
• the arrangement of plates relative to one another
  

Investigating which question will help a student find out whether the core of Mars is similar to the core of the Earth?

• Is the core of Mars metallic?
• What is the rate of rotation of the core of Mars?
• Is the core of Mars thicker than other layers of Mars?
• Does the core of Mars have a strong gravitational field?
  

The picture shows a model of the internal structure of Earth. Which evidence best supports this model?

• evaluations of seismic data
• direct observations of the layers
• samples of rocks from the layers
• explanations of the rock cycle
  

Which of the following has the greatest direct influence on movement of the lithosphere?

• the Sun
• the Moon
• Earth’s core
• Earth’s mantle
  

Due to extreme pressure, the inner core of Earth is

• solid.
• liquid.
• gas.
• plasma.
  

About how much of Earth's surface is covered in water?

• 50%

• 75%

• 3%

• 90%

Which section of Earth is composed primarily of liquid metal?

• crust
• mantle
• outer core
• inner core