Which layer contains soil?

• Mantle
• Asthenosphere
• Crust
• Mesosphere

Which layer is hottest?

• Crust
• Asthenosphere
• Mantle
• Core

What makes the inner core solid?

• Metals in the core are very light.
• Pressure at the core is very high.
• Chemicals in the core are very reactive.
• Temperatures in the core are very low.

Which layer contains BOTH the upper mantle and the crust?

• lithosphere
• atmosphere
• mesosphere
• athensosphere

Which layer is MOST dense?

• Mantle
• Crust
• Outer Core
• Inner Core

Which is the source extremely high temperatures in the Earth?

• Volcanoes
• Solar Radiation
• Earthquakes
• Heat created by the formation of the earth

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

The speed of seismic waves _____ through materials that are MORE dense. 

• increase
• decrease

How was the formation of the Earth similar to the formation of our solar system?

• The densest materials moved to the center.
• The densest materials moved to the outside.
• The densest materials moved to the middle layer.
• The densest materials were evenly distributed.