GLY CH9

The thinnest layer of Earth is the _______.

• crust

• inner core

• outer core

• mantle

• low velocity zone

Most of our knowledge about Earth's interior comes from __________.

• drill holes

• volcanic eruptions

• seismic waves

• examination of deep mine shafts

The record of an earthquake obtained from a seismic instrument is a(n) __________.

• seismograph

• seismogram

• time-travel graph

• epigraph

The slow continual movement, which occurs along some fault zones, is referred to as ____________.

• creep

• slip

• stick-slip

• strike-slip

• fault-slip

The average composition of the continental crust most closely approximates that of __________.

• granite

• basalt

• peridotite

• iron

The Mercalli scale rates earthquake intensity by determining ____________.

• the amount of damage to structures

• the maximum motion recorded on seismic instruments

• the number of faults in a region

• the heights of tsunami

• none of the above

The dense core of Earth is thought to consist predominantly of __________.

• nicke

• lead

• iron

• copper

The ____________ magnitude scale is a measure of the energy released. It does not directly measure the extent of building damage.

• Gutenberg

• Reid

• Mercalli

• Richter

The Mercalli intensity scale ranks earthquakes according to _____________________.

• Depth below the surface

• Magnitude

• Seismic wave amplitude

• Damage caused by an earthquake

• None of the above

This type of seismic wave travels most rapidly.

• P waves

• S waves

• surface waves

• tsunami

• seiches