Plate Tectonics Worksheet

A process where oceanic crust is formed at mid-ocean ridges and then gradually moves away.

• Sea-floor Spreading

• Plate Tectonics

• Convection Currents

• Convergent Plate Boundary

What is the difference between continental crust and oceanic crust?

• Continental crust is thicker, less dense and granitic, while oceanic crust is thinner, denser and basaltic.

• Continental and oceanic crust have similar thickness but differ in color.

• Continental crust is denser than oceanic crust, which is why continents float higher.

• There is no difference; both consist of the same materials.

The difference between ​ continental crust and ​ oceanic crust is that ​ (a)   crust is thicker, less dense and composed mainly of granitic rocks, while ​ (b)   crust is thinner, denser and mainly basaltic.

• continental
• oceanic
• lake
• river
• mountain

What happens at convergent plate boundaries?

• One plate subducts beneath another.

• Plates move apart, forming new crust.

• Plates slide past each other.

• There is no significant plate movement.

Provide an example of a geological feature formed by convergent boundaries.

• Mountain range

• Volcanic island

• Rift valley

• Mid-ocean ridge

What happens at divergent plate boundaries?

• Two tectonic plates move apart, allowing magma to rise and form new crust.

• Plates collide to form mountains.

• Areas of intense subduction leading to deep ocean trenches.

• Tectonic plates slide past one another.

Draw and label an illustration showing divergent plate boundaries.

What are transform plate boundaries and what is an example?

• They occur where plates diverge, as seen at the Mid-Atlantic Ridge.

• They occur where plates converge, as seen in the Himalayas.

• They occur where plates slide past one another, as seen at the San Andreas Fault.

• They occur where one plate subducts under another, as seen in the Mariana Trench.

What was Pangea and what is its significance in plate tectonics?

• A supercontinent whose breakup supports the theory of plate tectonics.

• A tectonic plate discovered in the early 20th century without any role in plate tectonics.

• A mountain range formed by continental collision.

• A volcanic island chain resulting from mantle plume activity.

How do fossils provide evidence for the theory of plate tectonics?

• They reveal similar fossil species on now separated continents.

• They show fossils only from one continent.

• They indicate that evolution happened independently in different continents.

• They provide evidence for climate change rather than plate tectonics.