Show:
Boundaries
Earthquakes
Volcanoes
Geosphere
Continental Drift and Miscellaneous
100
A few centimeters per year
What is speed of plate movement?
100
transform boundaries
Where do earthquakes form?
100
The amount of water vapor and other gases trapped in the magma
What is one factor that determines whether a volcanic eruption will be quiet or explosive?
100
The Asthenosphere
What is the weak mantle layer on which the plates of the lithosphere float?
100
The existence of coal beds in Antarctica (and fossils of warm climate plants)
What is an indication that the continent once had a warm rainy climate (because it was closer to the equator)?
200
Ocean ridges
Where is the youngest part of the ocean floor found?
200
focus
Where is the point in the earth's interior where the energy release of an earthquake occurs?
200
Rock and soil are enriched with valuable nutrients
What is a positive result of volcanic eruptions?
200
The hot, liquid iron/nickel layer that produces our earth's magnetic field
What is the outer core?
200
Matching rock structures on different continents
What is one piece of evidence for continental drift?
300
transform boundaries
Which boundary does not form crust but instead earthquakes?
300
do not travel through liquid
What is an S (or secondary) wave?
300
Particles of pulverized rock and glass
What is volcanic ash?
300
The largest layer of the earth's interior
What is the mantle?
300
Epicenter
What is the location on the earth's surface directly above the focus of an earthquake?
400
hotspots in the middle of plates
What is a weak spot in the earth's crust which form volcanoes?
400
P or primary waves
Which waves travel to the deepest center of the earth and arrive first at seismometers?
400
Convergent boundaries, divergent boundaries, and hot spots in the middle of plates
Where can volcanoes form?
400
The thinnest, brittle layer of the earth
What is the crust?
400
Mountain ranges (like the Himalayas)
What do continental-continental plate collisions create?
500
convection currents (heat) in the earth's mantle
What is the driving force of tectonic plates?
500
Surface waves
What are the slowest seismic waves which cause the most damage?
500
Damage to life and property
What is a drawback (or negative result) of volcano formation?
500
Continental and oceanic
What are the two different crusts (with different densities)?
500
Subduction
What occurs when one (denser) tectonic plate descends beneath another?