Region where plates with different densities collide and the denser plate sinks under the less dense plate
Mesosaurus fossils were found in South America and _________
The driving force behind plate movements
Magnetic field _________ are found on each side of mid-ocean ridges
Earth's crust and part of the upper mantle are broken into sections
The San Andreas Fault in California is this type of plate boundary
At what location does the first motion of an earthquake occur
A foreshock is
wave that can only travel through solids
The sudden return of elastically deformed rock to its undeformed shape
an instrument that records ground vibrations
A magnitude scale that measures ground motion
The point on Earth's surface directly above the earthquakes focus
An area where no direct seismic waves from a particular earthquake can be detected
The composition of Earth's Interior affects waves how?
any activity that includes the movement of magma toward or onto Earth's surface
fragments of rock that form during a volcanic eruption
Volcanic Eruptions may be signaled by
portion of earth's surface that is far from plate boundaries and experiences volcanism due to a rising mantle plume
Name four classifications of pyroclastic material
Viscosity
Which of the following is NOT a tectonic setting where volcanoes form? A) boundaries of tectonic plates B) glacier-formed crater lakes C) mid-ocean ridges D) subduction zones
A large depression formed by the collapse of a volcanic cone
Pillow lava forms where
quiet eruptions have what type of magma
What is a Subduction Zone?
Africa
What are Convection Currents?
reversals
what are plates?
What is a transform boundary?
the focus
a small earthquake
Secondary Wave (S Wave)
Elastic Rebound
Seismograph
Richter Scale
Epicenter
shadow zone
The speed and direction of seismic waves
Volcanism
Pyroclastic Material
A change in earthquake activity
Hot Spot
volcanic dust, volcanic ash, volcanic bombs, volcanic blocks, lapilli
resistance to flow
glacier-formed crater lakes
Caldera
on a mid-ocean ridge
mafic magma
