Easy Science Quest on Plate Tectonics Flashcards

Terms Definitions
Crust
Outermost layer
Crust
5 to 100 km thick
Crust
Made of oxygen, silicon, and aluminum
Mantle
Layer of Earth between the crust and the core
Mantle
Contains much of the Earth's mass
Mantle
Has more magnesium and less aluminum and silicon than the Earth's crust
Mantle
Is denser than the crust
Core
Located below the mantle and to the center of the Earth
Core
Believed to be mostly made of Iron
Iron
What is the core mostly made of?
Plate Tectonics
Greek word tektonikos of a builder
tektonikos
Greek word for tectonics
Plate Tectonics
Pieces of the lithosphere that move around; each has a name; fit together like jig-saw puzzles; float on top of the mantle like ice cubes in a bowl of water
Alfred Wegner
Proposed the continental drift theory in the 1900s
Continental Drift
Continents were once a single landmass and drifted apart; fossils of the same plants and animals are found on different continents; called it Pangea;
Pangea
Greek word for "All Earth" (245 million years ago)
245 million years
How long ago was Pangea?
Laurasia and Gondwana
Split again (180 million years ago)
180 million years ago
When did Pangea split again?
Transform Boundary
Ex: San Andreas fault in California
Crust
The thin and solid outermost layer of the Earth above the mantle
Mantle
The layer of rock between the Earth's crust and core
Core
The central part of the Earth below the mantle
Lithosphere
The solid, outer layer of the Earth that consists of the the crust and the rigid upper part of the mantle
Asthenosphere
The soft layer of the mantle on which the tectonic plates move
Mesosphere
The strong, lower part of the mantle between the Asthenosphere and the outer core
Transform Boundary
The boundary between tectonic plates that are sliding past each other horizontally
Compression
The stress that occurs when forces act to squeeze an object
Tension
The stress that occurs when forces act to stress an object
Folding
The bending of rock layers due to stress
Fault
A break in a body of rock along which one block slides relative to another
Uplift
The rising of regions of the Earth's crust to higher elevations
Tectonic Plate
A block of lithosphere that consists of the crust and the rigid, outermost part of the mantle
Continental Drift
The hypothesis that states that the continents once formed a single landmass, broke up, and drifted to their present locations
Sea-floor spreading
The process by which new oceanic lithosphere forms as magma rises towards the surface and solidifies
Plate Tectonics
The theory that explains how the tectonic plates move and change shape
Convergent Boundary
The boundary formed by the collision of two lithospheric plates
Divergent Boundary
The boundary between two tectonic plates that are moving away from each other
/ 38
Term:
Definition:
Definition:

Leave a Comment ({[ getComments().length ]})

Comments ({[ getComments().length ]})

{[comment.username]}

{[ comment.comment ]}

View All {[ getComments().length ]} Comments
Ask a homework question - tutors are online