6.5 Tectonics

What is the Earth's crust made of?

• Solid, rocky material

• Fluid mantle material

• Molten magma

• Gaseous layers

What lies directly beneath the Earth’s crust?

• Outer core

• Mantle

• Inner core

• Lithosphere

What is the estimated temperature of the Earth's inner core?

• 1000 °C

• 2500 °C

• Over 5000 °C

• 10,000 °C

Which process transfers heat through the mantle?

• Radiation

• Conduction

• Convection

• Sublimation

What causes the convection currents in the mantle?

• Rotation of the Earth

• Heating from the core

• Cooling from space

• Gravity from the Moon

What happens to mantle fluid when it is heated?

• It contracts and becomes denser

• It expands and becomes less dense

• It solidifies into rocks

• It evaporates

What causes tectonic plates to move?

• Convection currents in the mantle

• Earth's rotation

• Wind patterns

• Gravity from other planets

How fast do tectonic plates typically move?

• 10–20 cm per year

• 0.6–10 cm per year

• 1–2 meters per year

• They are stationary

What feature of Earth resembles a jigsaw puzzle?

• The mantle layers

• The arrangement of continents

• The core's structure

• Fossil formations

What is the term for the idea that continents were once part of a large landmass?

• Convection theory

• Continental drift hypothesis

• Fossil distribution theory

• Magnetic alignment model