Plate Boundaries

How do mountains form?

• An ocean plate sinks beneath another plate and begins to melt, sending melted rock to the surface, which forms volcanic mountains or islands.
• Hot rock from within the earth risies through ocean floor as plates separate. This forms a volcanic mountain chain, or ridge, on the ocean floor.
• Two continental plates collide, and the land folds and crumples like paper.
• All of the above.

Tags

NGSS.MS-ESS2-2

NGSS.MS-ESS2-3

 When a continental plate and an oceanic plate collide, the oceanic plate slides beneath the continental plate. This is called subduction. Why does this happen?

• The oceanic plate has water on top of it so it sinks.
• The continental plate is denser therefore it pushes down the oceanic plate.
• The oceanic plate is denser causing it to slide beneath the less dense continental plate.
• The continental plate is thicker therefore it stays on top.

Tags

NGSS.MS-ESS2-3

This type of crust is thick, less dense, and made mostly of granite.

• Oceanic crust
• continental crust

This type of crust is thin, dense, and made of basalt.

• oceanic crust
• continental crust

What type of plate boundary does not result in the formation of any new landforms?

• transform fault
• convergent boundary
• divergent boundary

 When two plates separate at a divergent boundary it creates a _________________.

• ridge
• trench
• mountain
• no new landform is created

Tags

NGSS.MS-ESS2-3

Hot, molten rock beneath Earth's crust is called

• lava
• magma
• lithosphere
• asthenosphere

What is true of tectonic plates?

• They are constantly moving

• Earthquakes cause them to move

• They don't move for centuries at a time

• There are fewer and fewer of them

Tags

NGSS.MS-ESS2-3

Which of the following best describes the location of the mantle?

• Above the crust

• Between the crust and the lithosphere

• Between the crust and the core

• Beneath the core

What is the underlying force that drives plate tectonics?

• ocean tides

• Volcanic eruptions

• convection currents

• the rock cycle

Tags

NGSS.MS-ESS2-3