Seafloor Spreading and Plate Tectonics Quiz

What are mid-ocean ridges also known as?

• Divergent plate boundaries

• Convergent plate boundaries

• Transform boundaries

• Continental shelves

(a)   are formed from cooling magma.

• Igneous rocks
• Sedimentary rocks
• Metamorphic rocks
• Sandstone rocks

What do magnetic minerals in magma do before the rock becomes solid?

• Align with the Earth's magnetic field

• Melt completely

• Turn into water

• Disappear

Another name for subduction zones is (a)  

• Convergent plate boundaries
• Divergent plate boundaries
• Transform boundaries
• Continental boundaries

What is the geologic memory of the direction of magnetic north locked in?

• Solid rock

• Liquid magma

• Water

• Air

Match the following geological features with their descriptions.

• Spreading center

• A place where rivers meet

• Confluence

• A place where new seafloor is created

• Desertification zone

• A place where mountains are formed

• Mountain range

• A place where deserts expand

What does the Earth's magnetic field act like?

• A giant magnet

• A river

• A mountain

• A volcano

What is the main difference between divergent and convergent plate boundaries?

• Divergent move apart, convergent come together

• Divergent come together, convergent move apart

• Both move in the same direction

• Both stay still

Match the following geological phenomena with their characteristics.

• Rocks with lower density

• Magnetic minerals align with the Earth's magnetic field before solidifying

• Sedimentary rock formation

• They become lighter

• Igneous rocks record the direction of magnetic north

• They form layers

• Some minerals undergo oxidation

• They change color

What is the role of magma in seafloor spreading?

• It rises and cools to form new seafloor

• It destroys old seafloor

• It forms mountains

• It creates rivers