Unit 4 - Restless Planet - Distribution and Plate Boundaries Flashcards
(21 cards)
What is Plate Boundary?
Where two different plates meet.
What are the two types of Crusts?
Continental Crust and Oceanic Crust
Features of the Continental Crust are…
Older - most over 1500 million years old.
Less Dense
Cannot be renewed or destroyed.
Features of the Oceanic Crust
Newer - most less than 200m years old.
Denser
Can Sink
Can be renewed and destroyed.
What are the four types of plate boundaries?
Constructive
Destructive
Conservative
Destructive (Collision)
What is a Constructive Plate boundary?
Where two plates are moving apart.
What is a Destructive Plate Boundary?
Where an oceanic and continental plate are moving towards each other.
What is a Conservative Plate Boundary?
When two plates are sliding alongside each other in different directions or at different rates.
What is Destructive (Collision)?
Where two continental plates are moving towards one another.
What is an example of Constructive Boundary?
Mid Atlantic Ridgez
What is an example of destructive collision?
Indo Australian and Eurasian - Himalayas.
What is a Fold Mountain?
Formed by plates pushing into each other; the rock at the plate edges folded upwards, making mountains.
What are plates?
Earth’s hard outer part is broken into big slabs called plates that move around.
Fill in the blanks; Earth’s crust is divided into ___________ which fit together like a jigsaw.
plates
Fill in the blanks; The heat in Earth’s core causes currents of hot _________________ to rise up towards the ______________.
(soft rock) (lithosphere)
When they reach ______________ they spread sideways and sink back down.
solid rock
Fill in the blanks; These cycles of movement are called ________________.
convectional currents
Fill in the blank; As these currents move they ________ the plates along with them.
drag
What is the Oceanic Crust?
Found underneath the oceans. It is denser than continental crust and can be subducted made of basalt.
What is the Continental Crust?
Found under land masses or continents. It is generally older than oceanic crust and is less often destroyed. It is made of granite.
What is the Crust?
Outermost layer of the Earth.
