Earth's Layers Quiz from "Earth How"

What is the densest material in the Earth's core?

• Iron and zinc

• Silicate rocks

• Lava

• Nickel and iron

According to the reading, what is the average density of the Earth's mantle?

• 9.9 g/cm3

• 3.9 g/cm3

• 2.7 g/cm3

• 5.0 g/cm3

What is the main component of the Earth's outer core?

• Water

• Nickel and iron

• Lava

• Silicate rocks

How do we know what's inside Earth?

• By observing the stars

• By using imaging and seismic tomography

• By physically going inside the Earth

• By analyzing ocean water

What is the temperature at the center of the Earth's inner core?

• 5500°C

• 9000°C

• 450-900°C

• 2000°C

What is the main reason we can't drill deep through Earth's interior?

• The absence of seismic waves

• The lack of suitable drilling equipment

• The presence of solid rocks

• The pressure and heat inside the Earth

What is the main component of the Earth's crust?

• Lava

• Silicate rocks

• Water

• Nickel and iron

What is the main role of the Earth's magnetic field?

• To protect the Earth from earthquakes

• To generate seismic waves

• To provide lubrication for plate tectonics

• To protect the Earth from charged particles from the sun

What is the main role of seismic waves in understanding the Earth's interior?

• To form the Earth's crust

• To create earthquakes

• To provide a clear picture of the Earth's interior

• To generate a magnetic field

What is the average thickness of the crust?

• 25-30 kilometers

• 20-25 kilometers

• 15-20 kilometers

• 10-15 kilometers