Shared Flashcard Set

Details

Plate Tectonics
Chapter 9 - Pearson Science Book
19
Science
6th Grade
01/24/2012

Additional Science Flashcards

 


 

Cards

Term
What happens during a continental drift?
Definition
Continents slowly move across Earth’s surface.
Term
Continents were once joined together 200 million years ago in a single landmass or super continent called what?
Definition
Pangaea
Term
What is a Fossil?
Definition
Preserved remains or traces of an organism that lived in the past.
Term
What is a Mid Ocean Ridge?
Definition
An undersea mountain chain where new ocean floor is produced.
Term
What is the process by which molten material adds new crust to the ocean floor?
Definition
Sea Floor Spreading
Term
Deep Ocean Trench is also known as what?
Definition
A deep valley along the ocean floor beneath which oceanic crust slowly sinks toward the mantle.
Term
What is Subduction?
Definition
The process by which oceanic crust sinks beneath a deep-ocean trench and back into the mantle at a convergent plate boundary.
Term
What is a Plate?
Definition
A section of the lithosphere that slowly moves over the asthenosphere, carrying pieces of continental and oceanic crust.
Term
What is a Divergent boundary?
Definition
A plate boundary where two plates move away from each other.
Term
What is a Convergent boundary?
Definition
A plate boundary where two plates move toward each other.
Term
What is a Transform boundary?
Definition
A plate boundary where two plates move past each other in opposite directions.
Term
What is the theory called where pieces of Earth’s lithosphere are in constant motion, driven by convection currents in the mantle.
Definition
Plate Tectonics
Term
What's another name for a break in Earth’s crust along which rocks move.
Definition
Fault
Term
What's another name for a deep valley that forms where two plates move apart.
Definition
Rift Valley
Term
What do mid ocean ridges form?
Definition
Long chains of mountains that rise up from the ocean floor.
Term
What does sea-floor spreading do the ocean floor?
Definition
It adds more crust to the ocean floor. At the same time, older rocks move away.
Term
What process takes 10 million years?
Definition
Part of the ocean sinks back into the mantle at deep ocean trenches.
Term
What is the mantle?
Definition
The layer of hot, solid material between Earth's crust and core.
Term
What area of the ocean floor does Subduction take place?
Definition
Deep Ocean Trench
Supporting users have an ad free experience!