things to study Flashcards
friday
how are fold moutains formed
where two or more of Earth’s tectonic plates are pushed together
explain continental drift
the gradual movement of the continents across the earth’s surface
convection currents
heat-driven cycles that occur in the air, ocean, and mantle
divergent vs convergent
divergent :Plates move apart from each other.
Convergent Boundaries: Plates move toward each other
tranform
occurs when two tectonic plates slide past each other horizontally, causing earthquakes
which plate is denser
The oceanic plate is denser
Which plate is less dense
continental plate is less
What is subduction?
one tectonic plate is forced beneath another
Two continental plates colldiing form?
they form mountain ranges
Two Oceanic plates colliding form?
ocean trench and may create a volcanic island arc
What is a rift valley?
a deep valley formed when two tectonic plates pull apart
What forms when an Oceanic plate subducts beneath a Continental plate?
it forms a trenches and often leads to the formation of volcanoes on the continent.
What is the supercontinent called?
Pangaea. It existed about 300 million years ago
Who was Alfred Wegner?
a scientist who proposed that continents were once joined together and have drifted apart over time.
What is the Theory of Plate Tectonics?
the Earth’s outer layer is made up of large plates that move slowly on the softer layer beneath.
