Earth Layers Quiz

What is the estimated age of the Earth?

• 4.54 billion years old

• 10 billion years old

• 6.78 billion years old

• 2.5 billion years old

What is the composition of the continental crust?

• Composed of silicon

• Rich in iron

• Primarily basalt

• Mainly granite

Which layer of the Earth is rigid and brittle?

• Asthenosphere

• Outer Core

• Mantle

• Lithosphere

What is the main component of the Mantle?

• Nickel

• Oxygen

• Silicon

• Magnesium

What causes the movement of Earth's crustal plates?

• Convection currents in the outer core

• Extreme temperatures in the mantle

• Flow in the asthenosphere

• Solid state of the inner core

Which type of rock is formed by magma and lava cooling?

• Sedimentary Rocks

• Volcanic Rocks

• Metamorphic Rocks

• Igneous Rocks

What is the characteristic of lava-cooled igneous rocks?

• Hard and colorful

• Light and airy

• Glassy

• Heavy and dense

How are sedimentary rocks formed?

• Through heat and pressure

• By magma cooling

• By volcanic eruptions

• From sediments pressed together

What is the primary component of the outer core?

• Iron

• Silicon

• Aluminum

• Magnesium

Which layer of the Earth is semi-rigid and allows crustal plates to float?

• Asthenosphere

• Mantle

• Lithosphere

• Inner Core