What are the 2 types of seismic waves and where do they travel?
Surface waves near earth's surface; body waves through the interior of earth.
Compare and contrast P-waves and S-waves.
Wow, you really know your stuff! / Sorry, we were looking for...
What is a seismograph and how does it help scientists?
An instrument that detects, measures, and records the energy of earthquake vibrations at a given location.
How many seismograph stations are required to determine the epicenter of an earthquake? Why?
Three; seismogrpahs measure time for wave to reach them, but lack directionality.
What is magnitude and in what units is it measured?
The measure of the energy released during an earthquake; the Richter scale.
Other than magnitude, what metric of earthquakes do scientists measure? Using what scale?
Intensity; the Mercalli scale.
What are the three types of volcanoes?
Cinder cone, shield, composite.
Why do so many island chains and island arcs form in the Pacific Ocean?
Wow, you really know your stuff! / Sorry, we were looking for...
What are dikes, laccoliths, and batholiths?
Magma hardened in vertical cracks across horizontal layers; dome-shaped cooled magma; large pockets of magma that reach deep into the crust.
What are dormant and extinct volcanoes?
"Asleep"; never observed to erupt.
