Earth's Composition and Plate Tectonics

What is the most abundant element in the Earth's crust?

• Silicon

• Oxygen

• Aluminum

• Iron

Which layer of the Earth is primarily composed of nickel and iron?

• Crust

• Mantle

• Inner Core

• Outer Core

What type of rock primarily composes the oceanic crust?

• Granite

• Limestone

• Basalt

• Marble

Which layer of Earth makes up about 80% of Earth's volume?

• Crust

• Mantle

• Outer Core

• Inner Core

What causes the inner core to be solid despite its high temperature?

• Chemical composition

• Low pressure

• Pressure freezing

• Low temperature

Tectonic plates float on which layer of the Earth?

• Lithosphere

• Asthenosphere

• Mantle

• Core

What type of boundary occurs when two plates move toward one another?

• Divergent

• Convergent

• Transform

• Conservative

At a divergent boundary, the plates move:

• Toward each other

• Away from each other

• Slide past each other

• Are stationary

Which boundary is also referred to as a conservative boundary?

• Divergent

• Convergent

• Transform

• Collision

The process where one tectonic plate is forced under another is called:

• Subduction

• Ridge push

• Slab pull

• Mantle convection