Earth Layers

Which layer of the Earth is the most dense?

• crust
• mantle
• inner core
• outer core

What are the layers of the Earth from the inside out in order?

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

The earth is protected from solar flares and cosmic rays by its magnetic field.  Where is this magnetic field generated?

• the outer core
• the crust
• the inner core
• the mantle

Compared to Earth's crust, Earth's core is believed to be

• less dense, cooler, and have more iron
• less dense, hotter, and has less iron
• more dense, hotter and have more iron
• more dense, cooler, and have less iron

The density of Earth's crust is

• less than the outer core but more than the mantle
• more than the outer core but less than the mantle
• less than both the outer core and mantle
• more than both the outer core and mantle

Which theory best explains the changing face of Earth and is driven by convection currents in the mantle?

• evolution
• plate tectonics
• big bang
• relativity

Sometime in the future, the outer core of the Earth will cool and solidify.  Which of the following will be caused by this change?

• Earth will cool and form a new Ice Age
• the Earth's magnetic field will collapse
• the inner core will harden as well
• the Earth's rotation will slow

While examining data at a seismic station, a scientist notices the seismograph registered a P wave from an earthquake, but no S wave was recorded.  Which of the following explains the missing S wave?

• the earthquake occurred on the ocean floor
• the station was too far away to detect it
• the outer core is between the earthquake and station
• the earthquake was only strong enough to make a P wave

Which Earth layer is the thickest?

• crust
• mantle
• outer core 
• inner core

What do geologists call the crust and upper mantle?

• asthenosphere
• stratosphere
• mesosphere
• lithosphere