What is the correct order (starting from the surface) of Earth's layers?

• crust, outer core, inner core, mantle
• mantle, outer core, inner core, crust
• crust, mantle, outer core, inner core
• outer core, inner core, crust, mantle

Which layer of Earth has the GREATEST density?

• crust
• mantle
• outer core
• inner core

Using data from seismic waves, geologists have learned that Earth's interior is made up of several

• continents
• layers
• ridges
• trenches

Scientists think that convection currents flow in Earth's

• continents
• mantle
• lithosphere
• inner core.

Which layer of Earth is the hottest?

• lithosphere
• asthenosphere
• outer core
• inner core

Compared to rock in Earth's crust, rocks in the mantle are more

• dense
• mineral-rich
• granular
• porous

If we compare the temperature and pressure of Earth's mantle to the core, what differences can we expect as we move downward into Earth?

• Both temperature and pressure increase.
• Both temperature and pressure decrease.
• Temperature decreases and pressure increases.
• Temperature increases and pressure decreases.

Which layer of Earth is LIQUID?

• upper mantle
• lower mantle
• outer core
• inner core

What are the two kinds of crust?

• lithospheric and asthenospheric
• silicon based and iron based
• continental and oceanic
• outer and inner

Which layer of Earth is the thinnest?

• crust
• mantle
• outer core
• inner core