What layer is the hottest?

• Core
• Crust
• Mantle

Which of the following apply to p-waves? (choose ALL that apply)

• compressional waves

• travel through solids, liquids, and gases

• only travel through solids

• fastest moving seismic waves

• shear waves

Where is heat and pressure the greatest in the Earth?

• crust

• mantle

• outer core

• inner core

How have scientists been able to infer the internal structure of Earth without being able to directly observe inside the Earth?

• Scientists analyze how earthquake waves move throught Earth's interior.

• Scientists use satellite radar and sonar technologies to map Earth's internal layers.

• Scientists make educated guesses about Earth's internal structure based on previous hypothesis.

• Scientists study different types of rocks from many different locations on Earth's surface.

What kind of seismic wave is being modeled by the slinky?

• p-waves

• s-waves

What kind of seismic wave is being modeled by the rope?

• p-waves

• s-waves

Why don't any s-waves travel through Earth's core?

• the outer core is liquid and s-waves can't travel through liquids

• the outer core is solid, and s-waves can't travel through solids

• the outer core is metallic and s-waves can't travel through metals

• the outer core is very hot, and s-waves can't travel through hot materials

Which layer is made up of iron and nickel?

• Crust
• Mantle
• Inner Core
• Lithosphere

What is radioactive decay?

• Damaging rays from the sun
• A source of heat inside the Earth
• Waves emitted from a radio
• The glue that holds the layers of the Earth together

Seismic waves _____ when they go from a solid to a liquid.

• Slow down
• Speed up
• Remain the same
• Slow down and then speed up