Earth's Structure

What causes the surface of the Earth to be in motion?

• Pressures inside the Earth

• The Sun's heat

• Ocean currents

• Human activities

Which of the following events are caused by pressures building up inside the Earth?

• Rainfall

• Volcanic eruptions

• Snowfall

• Wind

What are some forces that change the Earth's surface?

• Wind and water

• Fire and ice

• Sun and moon

• Stars and planets

How long has the surface of the Earth been in motion?

• Hundreds of millions of years

• Thousands of years

• Hundreds of years

• Decades

What are the three main layers of the Earth?

• A) Crust, Mantle, Core

• B) Crust, Surface, Core

• C) Mantle, Surface, Core

• D) Crust, Mantle, Surface

What is the state of the Earth's inner core?

• Solid

• Liquid

• Gas

• Plasma

Which layer of the Earth is liquid?

• Crust

• Mantle

• Outer Core

• Inner Core

What elements make up the Earth's inner core?

• Iron and Nickel

• Silicon and Oxygen

• Magnesium and Aluminum

• Hydrogen and Helium

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

• Silicon

• Iron

• Nickel

• Oxygen

Which layer of the Earth is the thickest?

• Crust

• Mantle

• Outer Core

• Inner Core