Terms in this set (30)
What letter is the crust?
Imagine that you could travel in a straight line through Earth from a point on one side and come out through the other side. What compositional layer would you travel through the exact center of the Earth?
Which compositional layer is the thinnest?
According to the map, where can you infer that mid-ocean ridges arebeing formed?
The middle of the oceans.
What occurs at divergent boundaries?
Sea floor spreading
What is a convection current?
Movement of fluid material due to differences in density caused by temperature.
Compare oceanic and continental crust.
Oceanic crust is thin, but more dense/ basaltic.
Continental crust is thick, but less dense/ Granitic.
Divergent Pate Boundary
Plates that move away from each other.
Plates that slide past each other.
Plates that come together; collision, two continental plates come together.
One plate that plunges under another plate.
In what units is plate tectonics measured in?
What happens when crustal plates move as shown in the figure?
Melting and then volcanoes.
Scientist think that the continents once formed a large, single landmass that broke apart then the continents slowly drifted to their present locations. What is the name given top this hypothesis?
Over long periods of time, plate tectonic forces can cause rocks to fold. What kind of stress causes this to happen?
Define srtike-slip fault.
Two plates slide past each other, getting stuck and thenm finally slip and move. This leads to Earthquakes.
Layers pushed together.
Volcanic vents are places where magma can erupt on Earth's surface. Which volcanic feature forms a relatively small depression around a volcano's vent?
Which type of volcano has the steepest sides?
Alternating quiet and violent eruptions are associated with what type of volcano?
Composite Volcano or Strato-Volcano.
Contrast magma and lava.
Magma- inside the earth
Lava- outside the Earth
Where are the strongest effects from an earthquake felt?
Near the Epicenter
Where do most earthquakes occur?
Near plate boundaries.
What process causes the plate to move over this hot spot?
Where did the highest concentration of earthquakes occur?
Ring of Fire
What was the cause of this tsunami?
An earthquake occuring under water.
Where is the focus of the earthquake located?
Which wave arrives first?
Point on the Earth's surface located directly above the focus of the earthquake.