Exit Ticket #67 U7 What happens with a lot of moving plates?

Trenches are an important piece of evidence to help us explore where Earth's plates are moving towards each other. 

What color is the trench on the map?

• green

• brown

• yellow

• dark blue

Through your experiments with Tectonic Explorer, you found that when two plates are moving towards each other, one goes under the other. 

• convergence

• subduction

• mountain building

• divergent

In the picture of the Andes mountains, the trench is shown as the darkest blue on the map. You can see the trench along the entire coast of the South American continent. How did the trench form?

• One plate is moving below the other plate.

• The two plates are moving apart.

• The two plates are both moving up.

• The two plates are moving side by side.

Order the liquids from least dense to most dense.

least dense <--> to most dense

(float) <--> (sink)

• light yellow liquid

• red liquid

• pink ball

• blue liquid

Oceanic crust always subducts (goes beneath) continental crust when plates with these crust types move towards each other.

What does this tell you about the density of the oceanic crust compared to the continental crust?

• The oceanic crust is less dense and floats.

• The oceanic crust is more dense and sinks.

• Density doesn't change the system.

• Rocks cannot be different densities.

What do we observe below the ocean in the Aleutian Island Chain?

Select all that you observe in the image.

• trench

• mid ocean ridge

• mountain

• continent

How do the mountains in the Aleutian Islands look different than the mountains in the Andes?

• The mountains formed under water.

• These two locations look identical.

• there is a trench

• there are earthquakes here