Layers of Earth
Plate boundaries
Plate tectonics
A Picture is Worth 1000 Words
Continental Drift
100
Which layer of the Earth is the thinnest?
What is the crust?
100
Describe how plates move at a divergent plate boundary.
What is the plates seperate?
100
Scientists think continents were once a large single landmass that broke apart and then the continents slowly to their present locations. What is the name given to this hypothesis?
What is Continental Drift?
100
This is a "rift valley" in Iceland. What type of plate boundary causes this?
What is "DIVERGENT"?
100
The scientist who came up with the Theory of Continental drift.
Who was Alfred Wegener??
200
How is the outer core different than the inner core?
What is the outer core is LIQUID and the inner core is SOLID?
(The outer core is also not as hot as inner core)
200
Subduction is one plate sinking under another plate. If an oceanic plate and a continental plate collide, name the plate that will subduct.
What is the oceanic plate?
200
Name the boundary when two tectonic plates push against each other.
What is a convergent boundary?
200
In this diagram, the red arrows show that material in the mantle rises because its hot, but then cools and sinks after it reaches the lithosphere, This makes plates move.
What would be a good label for the red arrows, given the possibilities below:
a. slab pull
b. gravity
c. convection currents
d. divergent plate boundary
What are "convection currents"?
200
The original (first) observation that Alfred Wegener made that led him to his idea that continents have drifted over time.
What is the observation that the continents (as see on a map) fit together at their boundaries, like puzzle pieces?
300
Going from inner layer to outer layer, name the 4 layers of the earth.
What is the inner core, the outer core, the mantle, and the crust?
300
When an oceanic plate and a continental plate collide (converge), name what geological feature forms upon the continental plate.
What is a volcanic mountain arc?
300
Describe what happens at a transform boundary.
What is two plates move horizontally past one another?
300
This diagram shows the movement of the Indian Plate over time. What kind of plate boundary is between the Indian and the Eurasian plates today (include C-C, C-O or O-O)
What is "CONVERGENT C-C"?
300
One of the several pieces of evidence used to support the Theory of Continental drift.
Any one of the following:
-fossils found on different continents
-matching rock and rock layers found on different continents
-glacier marks found on different continents
-sonar maps of ocean floor, showing continents fit together
400
The layer of the earth that has both rigid and flow-y (taffy-like) parts.
What is the mantle?
400
Explain a convection current.
What is when a warmer substance rises as a cooler substance sinks?
400
Describe why are there no major earthquakes recorded in the interior of the continent of Africa.
What is the entire continent of Africa is located on a single continental tectonic plate?
or
Because there are no plate boundaries there.
400
The name for the geological structure that is circled in red:
What is a "mid-ocean ridge"?
400
Two processes that cause plates to move.
What is gravity and convection?
500
This physical layer of the earth is divided into pieces called tectonic plates.
What is the lithosphere?
500
Most divergent boundaries lie under the world's oceans. Which of these is a process that occurs at divergent boundaries: old crust subducts, new crust forms, plates slide past each other, or continental collisions occur?
What is, "new crust forms"?
500
The name of the man who came up with the idea that continents moved (continental drift).
Who is "Alfred Wegener"?
500
Discuss why there are so many earthquakes in some place of the world and so few (or none!) in others.
What is earthquakes occur the most frequently along plate boundaries? (As plate boundaries move, stress builds up along the places where they meet. Eventually the rock layers "snap" and earthquakes occur.)
500
The speed at which the continent of North America is moving away from Eurasia at this very moment, given these choices:
a. 20 km per year
b 2 cm per year
c. 1/2 mile per year
d. 20 cm per year
What is "2 cm per year"?