1.1 The Earth's Structure

What is the shape of the Earth?

• perfect sphere
• oblate spheroid
• cube

An artificial satellite orbits the Earth at a height of 500 km. What is the approximate value of the radius of the satellite’s orbit?

• A 3000 km
• B 7000 km
• C 13 500 km
• D 26 500 km

Which of the Earth’s internal divisions lies directly above the outer core?

(a)  

The diagram shows the Earth’s four internal divisions (not to scale). What is the name of the division labelled X?

• A atmosphere
• B crust
• C inner core
• D outer core

What are the names of the two most common elements in the Earth’s core?

• iron
• nickel
• helium
• sulfur
• silicon

What are the names of the two most common elements in the Earth’s crust?

• silicon
• oxygen
• helium
• iron
• sulfur

Which of the Earth’s major divisions in the thinnest?

• A atmosphere
• B crust
• C inner core
• D mantle

What causes the Earth's seasons?

• A The Earth's rotation on its axis

• B The Earth's orbit around the Sun in an elliptical shape

• C The tilt of the Earth's rotational axis away or toward the Sun

• D The distance between the Earth and the Sun

What layer of the Earth lies directly below the crust?

• A Mantle

• B Outer core

• C Inner core

• D Atmosphere