Plate Tectonics

The uppermost part of the mantle and the crust are the solid parts of the Earth, called...

The lithosphere is divided into huge pieces called...

The semi-solid part that lies below the lithosphere is called...

Draw the internal structure of the Earth.

Which of the following contributes to tectonic plate movement?

• Centrifugal force of Earth's rotation

• Convection currents in asthenosphere

• Slap-pull force when denser plate subducts

• Tidal pull from moon on the ocean

Earthquakes may be found at which boundaries?

• Convergent plate boundaries

• Divergent plate boundaries

• Transform plate boundaries

Volcanoes can be found at what boundaries?

• Convergent plate boundaries

• Divergent plate boundaries

• Transform plate boundaries

Which of the following statements is FALSE?

• Seafloor spreading happens when magma from deep within the Earth rises through mid-ocean ridges to form new oceanic crusts.

• Rocks near the crest of the mid-ocean ridges are older and are progressively younger further away from the mid-ocean ridges.

• The formation of new oceanic crusts at mid-ocean ridges explains why oceanic crusts are younger than continental crusts.

• The destruction of older oceanic crusts at trenches explains why there is little sediment accumulation at oceanic trenches.

Draw magnetic striping about a mid-ocean ridge to support the plate tectonics theory.

The broad belt where most tectonic activities occur is called...