Earth Science Flashcards
Lithosphere
The outer layer of the Earth
Asthenosphere
The upper layer of the Earth’s mantle, just below the lithosphere
Mantle
The layer between the lithosphere and the core
Core
The central region of the Earth
Seismic Waves
Waves of energy that travel through the Earth’s crust caused by earthquakes
Continental drift
Movement of the plates of the earth’s crust in relation to each other
Pangaea
A super-continent that existed about 225 million years ago. All of the land masses at this time were joined together to create a super-continent
Panthalassa
The vast sea surrounding the supercontinent of pagaea
Plate tectonics
The theory concerning the movement of the continental plates
Convection current
Circular movement the occurs when the warmer, less dense fluid particles rise and cooler, dense fluid particles sink
Continental crust
The plates of the Earth’s crust that make up the land
Oceanic crust
one of the types of crust that makes up the Earth’s outer layer. Oceanic crust is thinner than continental crust and made up of dense, heavy rocks such as basalt.
Boundaries
The edges of the tectonic plates
Subduction
process in which two tectonic plates push against each other, and oceanic crust sinks below the less dense continental crust
Destructive plate boundaries
convergent boundary where two plates collide
Constructive plate boundaries
plate that creates new land from cooling magma