Plate Tectonic Boundaries
When plate boundaries move towards each other, what will likely occur?
mountain building
What causes a heat transfer in the Earth?
convection currents in the mantle
Volcanoes and earthquakes often occur in similar locations is evidence of continental drift. (True/ False)
True
The movement of the plate tectonics is known as _____.
a. law
b. theory
c. hypothesis
theory
What is the colliding of plate tectonics?
convergent
What plate movement causes mountains?
Convergent movement, colliding
Which layer of the Earth does convection currents (heat transfer) occur?
Mantle
Who was the creator of the theory of continental drift?
Alfred Wegener
Plate tectonics can move through because of what in the mantle?
convection currents
What movement forms mountains?
convergent: colliding plates
What are the three ways Tectonic boundaries can move?
Convergent, Divergent, Transform
What are some reasons that scientist use models to study the layers of the Earth?
1. Cannot directly observe the layers of the Earth
2. Earth's layers are too big to observe
3. Scientists cannot drill past the crust
How are earthquakes going to form?
Where the plate tectonics slide past each other (transform)
What effect does sea-floor spreading and subduction both serve?
Sea-floor spreading creates new crust, Subduction destroys old crust.
How are earthquakes formed?
Transform Faults
What forms due to divergent plates?
Valleys
The Earth's core is ____(hotter, colder) and has ____(more, less) iron than the Earth's crust.
hotter, more iron
Where does the earthquakes and volcanic activity occur?
a. oceanic crust
b. Mountain
c. boundaries of the plate tectonics
boundaries of the plate tectonics
What was the name of the super continent that Wegner's theory of continental drift was based upon
What is Pangea?
How does the eruption of volcanoes affect the Earth's atmosphere?
It releases ash into the atmosphere.
Why does the oceanic crust sink beneath the continental crust?
oceanic crust has a greater density
Where does the main heat source come from to cause the plate tectonics to move?
EARTH'S MANTLE AND CORE
What are the 4 pieces of evidence that prove continental drift?
1.Fossils of the same plants and animals in different places
2. Shaped like a puzzle
3. Similar mountain range
4. Similar rock typesWhy were scientist skeptical about trusting Wegner's theory of Continental drift?
Because he had no evidence to support his theory
If subduction occurs, what will cause the oceanic crust to sink and collide with the continental crust?
oceanic crust has more density