Earth's Structure and Composition: A

Earth's surface is part of the:

• asthenosphere
• lithosphere
• stratosphere
• troposphere

Which of the following layers is the densest?

• the core

• the mantle

• the oceanic crust

• the continental crust

Earth's Inner core is?

• A layer of rock that forms Earth's outer surface

• A layer of molten (liquid) iron and nickle

• A layer of solid iron and nickel

• A solid/plastic layer of Peridotite that flows over time?

The Earth's Mantle is made up of?

• A solid layer of Iron and Nickel

• A molten (liquid) layer of of Iron and Nickel

• A solid layer of Granite and Basalt

• A solid/plastic layer of molten rock

The outer layer of the Earth is called the

• Crust

• Mantle

• Inner core

• Asthenosphere

What is the name of the supercontinent that formed from about 200-100 million years ago?

• Pangaea

• Laurasia

Who first proposed the theory of continental drift'?

• Galileo

• Wegener

• Hess

What is an underwater mountain range where new ocean floor is made?

• subduction

• mid-ocean ridge

• deep-sea trench

Scientists think that the continents once formed a giant landmass that broke apart, and then slowly drifted apart. What is the name given to this hypothesis?

• sea-floor Spreading

• plate tectonics

• continental drift

• Pangaea

Most geologist think that the movement of Earth's tectonic plates is caused by

• the rotation of the Earth.

• the Earth's magnetic field.

• subduction.

• convection currents.