Plate Tectonics and Boundaries

What is a triple junction?

• A point where two plate boundaries meet

• A point where three plate boundaries meet

• A point where four plate boundaries meet

• A point where five plate boundaries meet

Which plate is used as an example to explain the concept of triple junctions?

• Atlantic Plate

• Pacific Plate

• Indian Plate

• Eurasian Plate

How did the Pacific Plate grow over time?

• By accretion on all sides

• By splitting into smaller plates

• By subduction on all sides

• By collision with other plates

What significant event happened to the Pacific Plate around 42 million years ago?

• It formed a new oceanic crust

• It collided with the African Plate

• It split into two plates

• It stopped moving

What fault was formed when the ridge collided with the subduction zone?

• Denali Fault

• Anatolian Fault

• Alpine Fault

• San Andreas Fault

In the simple exercise, what happens to the smaller plate B as it moves to the right?

• It forms new oceanic crust on the left and subducts on the right

• It splits into two smaller plates

• It forms new oceanic crust on the right and subducts on the left

• It remains stationary

What is formed on the left side of plate B as it moves to the right?

• A transform boundary

• A ridge

• A trench

• A hotspot

In the complex exercise, what happens to the markers on the plates over 30 million years?

• They move closer together

• They remain stationary

• They move away from each other

• They disappear

What type of boundary is formed if the velocity of plate B is exactly parallel to the boundary?

• A subduction zone

• A transform boundary

• A trench

• A ridge

What is the significance of the small mini plate important for California tectonics?

• It is part of the plate being subducted under South America

• It is part of the African Plate

• It is part of the Eurasian Plate

• It is part of the Pacific Plate