Misc.1
This wave travels faster, records a lower signal strength, and causes less damage.
P waves
What causes the plates to move?
convection currents
A break in the crust along which rocks move is a...
Fault
This wave travels slower, records a stronger signal strength, and causes more damage.
Surface waves
When two plates move horizontally past one another
Transform boundaries
The point underground where the movement of the earthquake first takes place is called...
Focus
An underground holding pool for hot magma is called a...
Hot mantle plume/magma chamber
What evidence did Hess bring for Wegener's theory
seafloor spreading
When two tectonic plates collide with one another, causing subduction and or mountain building
convergent boundaries
The Richter Scale is used to measure the ___ of an earthquake
magnitude
Melted rock that flows out onto Earth's surface is...
Lava
Wegener called the large landmass
Pangea
When two oceanic plates converge they form a ______ at the bottom of the ocean floor
trench
Scientists think continents were once a large single landmass that broke apart and then the continents slowly DRIFTED to their present locations. What is the name given to this hypothesis?
Continental Drift
Scientists measure earthquake waves with a...
seismograph
A mountain shaped structure that forms from lava is a ...
volcano
An Earthquake in City A registers 5.6, City B 7.8, and City C 6.8. Which city had the strongest earthquake?
City B
What else did Wegener find to help bring evidence for his theory?
fossils and rock layers
When two plates move away from one another
divergent boundaries
The point of Earth's surface that is directly above an earthquake's focus is the...
epicenter
Name two ways volcanoes can form
divergent boundaries or convergent boundaries with subduction
Hot melted rock that is underground is called...
Magma