Earth's Structure Quiz

Which type of crust is older?

• Continental Crust

• Oceanic Crust

• They are the same age

• The crust isn't alive so they don't have an age

Answer explanation

The continental crust is older than oceanic crust. Continental crust can be billions of years old, while oceanic crust is continuously formed and recycled at mid-ocean ridges, typically being less than 200 million years old.

What happens in a Convection Current?

• Cold Magma moves left, hot magma moves right

• Hot magma moves left, and cold magma moves right

• Hot magma rises, cold magma lowers

• Hot Magma lowers, cold magma rises

Answer explanation

In a convection current, hot magma rises due to its lower density, while cold magma sinks as it is denser. This process creates a continuous cycle of movement, making 'Hot magma rises, cold magma lowers' the correct choice.

What happens to the oceanic plate in a subduction zone?

• They collide and nothing happens

• They hit each other and don't move

• It gets pushed up to form mountains or volcanos

• It gets pushed down into the mantle

Answer explanation

In a subduction zone, the oceanic plate is denser than the continental plate, causing it to be pushed down into the mantle. This process leads to geological activity such as earthquakes and the formation of volcanic arcs.

A Divergent oceanic oceanic plate boundary can make what?

• Mid Ocean Ridge

• Valley

• Mountain

• Volcano

Answer explanation

A divergent oceanic plate boundary occurs where tectonic plates move apart, creating new oceanic crust. This process forms a Mid Ocean Ridge, which is characterized by underwater mountain ranges.

What forms at a transform plate boundary?

• Volcanic Island Arc

• Mountains

• Fault Line

• Trench

Answer explanation

At a transform plate boundary, tectonic plates slide past each other, creating stress that leads to the formation of fault lines. Unlike convergent or divergent boundaries, transform boundaries do not typically create volcanic features or trenches.

A place where two plates slip past each other, moving in opposite directions, is known as a _______

• transform boundary

• divergent boundary.

• convergent boundary.

• rift valley.

Answer explanation

A transform boundary is where two tectonic plates slide past each other in opposite directions. This movement can cause earthquakes, distinguishing it from divergent and convergent boundaries, which involve plates moving apart or together.

The place where two plates come together is known as a _______

• transform boundary.

• divergent boundary.

• convergent boundary.

• rift valley.

Answer explanation

The correct answer is 'convergent boundary' because it refers to the area where two tectonic plates collide or come together, often leading to geological features like mountains or earthquakes.

Below is a picture of sea-floor spreading. How are the ocean crusts moving?

• Converging

• Diverging

• Sliding

• No movement

Answer explanation

In sea-floor spreading, the ocean crusts are moving apart, which is known as diverging. This process occurs at mid-ocean ridges where new crust is formed as magma rises to the surface.

What are Tectonic Plates?

• A continent 

• The Trees in Vietnam 

• ThE PlaTES That MoVE uNdERGRound :)

• The Plates that move the Continents

Answer explanation

Tectonic plates are large sections of the Earth's lithosphere that move and interact with each other. This movement is responsible for the shifting of continents, making "The Plates that move the Continents" the correct choice.

What is Pangaea?

• the name of a German scientist

• the name of the super-continent that existed millions of years ago

• another name for continental drift

• the name of an ancient fossil

Answer explanation

Pangaea is the name of the super-continent that existed millions of years ago, when all the continents were joined together. This distinguishes it from the other options, which do not accurately describe Pangaea.