Plate Tectonics

Front

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

Back

lithosphere

Front

The lithosphere is divided into huge pieces called...

Back

tectonic plates

Front

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

Back

asthenosphere

Front

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.

Back

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

Front

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

Back

Pacific Ring of Fire