Plate Tectonics (Tectonics Topic 1)

What does the plate tectonic theory explain about the structure of the Earth?

• The Earth is made up of only one solid layer.

• The Earth has a 3-layered structure with a lithosphere broken into tectonic plates.

• The Earth is completely liquid inside.

• The Earth does not have any moving parts.

What are the two types of tectonic plates?

• Continental and oceanic

• Inner and outer

• Hot and cold

• Thick and thin

What is the lithosphere made up of?

• Only the core

• The uppermost part of the mantle and the crust

• Only the crust

• Only the mantle

What causes the rocks in the asthenosphere to melt?

• Pressure from the crust

• Heat from the core

• Movement of tectonic plates

• Water from the ocean

Which layer lies directly below the lithosphere?

• Crust

• Core

• Asthenosphere

• Oceanic plate

How do plate movements affect the Earth's surface?

• They keep the surface unchanged.

• They result in the formation of landforms and phenomena like earthquakes and tsunamis.

• They only affect the core.

• They make the Earth spin faster.

Which type of plate boundary occurs when plates are moving away from each other?

• Divergent plate boundaries

• Convergent plate boundaries

• Transform plate boundaries

• Subduction plate boundaries

What are the two main forces responsible for plate movements?

• Convection currents and slab-pull force

• Gravity and wind

• Ocean currents and magnetic fields

• Solar radiation and erosion

How do convection currents in the mantle contribute to tectonic plate movement?

• By causing the mantle material to rise and spread beneath plates, dragging them apart

• By cooling the earth’s core

• By increasing the density of the crust

• By stopping plate movement

What happens when two plates converge and slab-pull force acts on the denser oceanic crust?

• The crust floats on the mantle

• The plates move apart

• The denser crust is pulled down by gravity and sinks into the mantle

• The plates stop moving