Vocabulary
What is subduction?
Where old ocean crust sinks into the mantle
Which boundary has plates that move apart?
Divergent boundary
Which Earth layer is found directly below the lithosphere?
Upper mantle
What forms when magma melts through the crust above a hot spot?
Volcanic island
What is sea-floor spreading?
New ocean crust forms at mid-ocean ridges
Which boundary forms mid-ocean ridges?
Divergent boundary
Which map helps identify plate boundaries?
ESRT Plate Tectonics Map
Where does new ocean crust form?
Mid-ocean ridges
What is a trench?
A deep valley in the ocean where subduction happens.
Which boundary causes the most earthquakes?
Transform boundary
Which ESRT model shows the layers of the Earth?
Earth’s Interior diagram
What moves away from the ridge during sea-floor spreading?
Oceanic plates / ocean crust
What is a ridge?
A long underwater mountain chain
Which boundary is found along the Aleutian Trench?
Subduction (or Convergent)
Which ESRT model shows hot spots and magma rising?
Cross Section Model of Earth’s Surface and Interior
What is the youngest crust found closest to?
The mid-ocean ridge
What is a transform boundary?
Plates slide past each other
Which boundary has one plate sinking beneath another?
Subduction
Which ESRT resource would you use to locate trenches and ridges?
Plate Tectonics Map
What is the oldest crust found farthest from?
The mid-ocean ridge