Divergent Plate Boundary

"ductile layer of rocks within the mantle at extremely high temperature, which makes it capable of slow flowage"

What is the above feature?

• Crust

• Asthenosphere

• Magma

• Lithosphere

Select the CORRECT statement.

• Continental crust lies on top of oceanic crust.

• Oceanic crust is younger than continental crust.

• Continental crust is denser than oceanic crust.

• A tectonic plate can only have either continental or oceanic crust.

Identify -- "As oceanic plate subducts, it directly pulls the rest of the plate along towards the subduction zone since it is denser than the underlying asthenosphere. Plate motion is thus partly driven by the weight of cold, dense plates sinking into the mantle at ocean trenches."

• mantle convection currents

• subduction

• seafloor spreading

• slab-pull force

Divergent plate boundaries are also known as _________ plate boundaries.

• conservative

• constructive

• destructive

• transform

Which of the following is NOT a resultant landform of continental-continental divergence?

• rift valley

• block mountain

• lakes

• volcanic islands

Most of the volcanoes formed from continental-continental divergence have different lava from most of the volcanoes formed from oceanic-oceanic divergence.

True or False?

• True

• False

The only major site where a mid-ocean ridge appears above sea level is Iceland. This is because other than being located at the plate boundary between North American and Eurasian Plates, Iceland also sits on top of a _________________.

• volcano

• magma chamber

• mantle plume

• lava reservoir

Select the CORRECT statement.

• Age of rocks increases with increasing distance away from the plate boundary of 2 oceanic plates.

• Soda lakes formed at continental-continental divergent plate boundaries are extremely acidic.

• Seafloor spreading at oceanic-oceanic divergent plate boundaries cause volcanic islands that are formed there to shift nearer to the plate boundary.

• Volcanoes formed at continental-continental divergent plate boundaries have gentle quiet eruptions.

Identify A and B.

• A - fault scarps

  B - step faulting

• A - step faulting

  B - grid faulting

• A - grid faulting

  B - step faulting

• A - escarpment

  B - fault scarps