Plate Boundaries
The three types of plate boundaries
What are the mechanisms that move tectonic plates?
Slab pull, Ridge push, Mantle convection
List Earth's compositional layers.
Crust, mantle, core.
What is plate tectonics?
The theory explaining the large scale movements of the lithosphere
Define a mid-ocean ridge.
Where two oceanic plates are pushed apart
Which direction do plates move at a divergent boundary?
Away from each other
Explain slab pull.
When a more dense plate subducts under a less dense one
List Earth's physical layers.
Lithosphere, Asthenosphere, Mesosphere, Inner core, Outer core.
What is the difference between plate tectonics and tectonic plates?
One is a theory, one describes the pieces of the Lithosphere.
Define an ocean trench
The land from that forms at a underwater subduction zone
What does a transform plate boundary cause?
Earthquakes and Tsunamis
explain ridge push.
As newly formed rock cools, it becomes more dense and is pushed away from the less dense rock, moving plates apart.
How are the physical layers characterized?
By their physical properties.
What are the pieces of evidence supporting the theory of plate tectonics?
Fossil correlation, mountain correlation, the appearance of the continents, and the glacial evidence.
Describe sea-floor spreading
When new oceanic lithosphere is created and old pieces are pushed away
What plate boundary happens at a subduction zone?
Convergent
In which of the three mechanisms does density play a role?
All of them
By chemical makeup.
Who first proposed the plate tectonics?
Alfred Wegener
Where can oceanic crust be found?
In the ocean 🤯️
How many toes on each paw does your average cat have?
4.33333333333333333333333333333333333333333333 repeating
Which of the three mechanisms do scientists think play the greatest role in moving the plates?
Slab pull
What are the properties considered in the physical layers?
Whether it is solid or liquid, how it moves, how it transmits waves
How many large tectonic plates are there?
Seven
What is the difference between oceanic and continental crust?
Continental is thicker but more dense then oceanic