Astronomy Quiz 6

From the center outward, the correct order of the zones of the Earth is

• Solid core, mantle, liquid core, crust, atmosphere

• Liquid core, solid core, crust, mantle, atmosphere

• Solid core, liquid core, mantle, crust, atmosphere

• Liquid core, solid core, mantle, crust, atmosphere

Why does plate tectonics continue to occur on Earth?

• The Earth is still cooling from its formation.

• The Earth contains radioactive elements.

• The Earth is heated by the Sun.

• Both A and B.

• Both A and C.

The Earth's atmosphere today is about 78% _____, 21% _____, and much less than 1% _____.

• Oxygen, nitrogen, carbon dioxide and other gases

• Nitrogen, carbon dioxide, oxygen and other gases

• Oxygen, carbon dioxide, nitrogen and other gases

• Nitrogen, oxygen, carbon dioxide and other gases

The most abundant element in the Earth's core is ___________.

• Nitrogen

• Oxygen

• Hydrogen

• Iron

The interior layer just below the crust of the Earth is called the _______.

• Inner core

• Outer core

• Mantle

• Troposphere

The hotter inner core of the Earth is _______ and the relatively cooler outer core is ______.

• Solid; also solid

• Liquid; also liquid

• Liquid; solid

• Solid; liquid

Why is the Earth's inner core solid?

• Due to extremely high temperature

• Due to the tremendous pressure of overlying material

• Due to the spinning of the Earth

• Due to the orbital motion of the Earth

What is the approximate age of the Earth?

• 3000 years

• 6000 years

• 1,000,000 years

• 4.6 million years

• 4.6 billion years

Scientists refer to the Earth as a differentiated planet because ______.

• The temperature in the core is higher than the temperature on the surface

• The material in the interior of the Earth is separated by density

• Iron is more dense than silicate material

• The Earth's structure is different from the other planets

The ______ are two doughnut-shaped rings of charged particles trapped by the Earth's magnetic field.

• Aurora Borealis and the Aurora Australis

• Van Allen radiation belts

• Jet streams

• Convection cells