What is the primary method used to infer the properties of the Earth's interior?

• Using satellite imagery

• Observing volcanic eruptions

• Studying earthquake waves and meteorites

• Drilling deep holes into the Earth

Which two layers make up the lithosphere?

• Crust and asthenosphere

• Outer core and inner core

• Crust and rigid mantle

• Asthenosphere and stiffer mantle

What is the density range of the Earth's outer core?

• 12.8 to 13.1 g/cm³

• 9.9 to 12.2 g/cm³

• 3.4 to 5.6 g/cm³

• 2.7 to 3.0 g/cm³

How does pressure change as you go deeper into the Earth?

• Pressure remains constant

• Pressure increases

• Pressure decreases

• Pressure fluctuates

At what pressure does the outer core begin?

• 0.1 million atmospheres

• 3.1 million atmospheres

• 3.6 million atmospheres

• 1.5 million atmospheres

What is the relationship between temperature and depth within the Earth?

• Temperature remains constant

• Temperature fluctuates with depth

• Temperature decreases with depth

• Temperature increases with depth

Which layer of the Earth begins at approximately 5,000°C?

• Outer core

• Asthenosphere

• Lithosphere

• Stiffer mantle

What happens when the interior temperature is above the melting point?

• The layer becomes gaseous

• The layer becomes liquid

• The layer remains unchanged

• The layer becomes solid

At what depth does the stiffer mantle begin?

• 2,900 km

• 800 km

• 100 km

• 5,100 km

Which layer of the Earth extends from about 2,900 km to 5,100 km?

• Lithosphere

• Asthenosphere

• Inner core

• Outer core