Lesson 1
What the definition of Pangea?
A supercontinent were all continents are touching.
What happens to earths poles when a magnetic reversal occurs?
The poles switch places.
what are the three main plate boundaries?
Divergent convergent and transform.
What does ridge push do?
Pushed tectonic plates from away from ocean ridges.
What is the lithosphere.
A part of earths outer layer made up of crust and mantle.
What do scientist say cause continental drift?
The movement of tectonic plates.
Definition of reversed polarity?
When earths magnetic fields flip.
True or false convection currents move tectonic plates?
True
What is the definitions of subduction.
When one plate is forced under the ground by another.
Which one of the three plate boundaries cause subduction.
Convergent plate boundary.
Who discovered continental drift?
Alfred Wegener.
what is the definition of normal polarity.
When the earths magnetic field is aligned.
Tectonic plates move apart making crust.
Define slab pull?
When a sinking tectonic plate causes the rest of the plate to sink.
What natural disaster does tectonic plate boundary cause?
Earthquakes.
What does evidence that the continents were once a supercontinent support the idea of continental drift?
It shows how the plates slowly moved apart over time.
What makes up the mid ocean ridge?
Under water mountain ranges.
What happens during a tectonic plate boundary?
Tectonic plates slide past each other.
The heat from earths core.
What force causes tectonic plates to sink?
Slab pull.
When continental drift was first theorized what evidence did they have for it?
Some continent fit like a puzzle and fossils from animals were found across different continents.
What causes sea floor spreading?
When magma rises at mid ocean ridges creating new crust.
What happens during a convergent plate boundary?
Tectonic plate move towards each other.
What plate boundary is most frequent?
tectonic plate boundary.
What plate boundary occurs the least.
convergent plate boundaries.