Unit 7 Lesson 3

What is Earth's deepest layer composed of?

• Solid inner core of very hot metal

• Liquid outer core of hot metal

• Mantle of dense rock

• Thin rocky crust

Which layer of Earth is liquid?

• Inner core

• Outer core

• Mantle

• Crust

What is the largest and thickest layer of Earth?

• Crust

• Mantle

• Outer core

• Inner core

What are tectonic plates?

• Sections of Earth's crust and solid top of the mantle

• Layers of Earth's core

• Types of Earth's crust

• Parts of the oceanic crust

What happens at mid-ocean ridges?

• Tectonic plates move apart and new crust is formed

• Tectonic plates collide and form mountains

• Tectonic plates slide past each other

• Tectonic plates subduct under one another

What is subduction?

• A process where one tectonic plate slides under another

• A process where tectonic plates move apart

• A process where tectonic plates slide past each other

• A process where tectonic plates form new crust

Who discovered that Earth's core has two parts?

• Inge Lehmann

• Alfred Wegener

• Isaac Newton

• Marie Curie