Chapter 19.2-19.4

True

P-waves are bent when they strike the core

Mass

Suspended from a wire

Seismogram

A paper or computer record of earthwuake vibrations is called a ____

The Ritcher scale is a numerical scale used to describe and earthquakes...

Magnitude

The amount f energy released by an earthquake is measured by its...

Magnitude

False

On seismograms,seismic waves recorded from more distant facilities are closer together than those recorded from facilities close to the epicenter.

True

P-waves travel through Earth's mantle

False

S-waves do not enter the core because they cannot travel through solids.

False

S-waves do not travel through Earth's mantle.

True

Seismic waves change speed and direction when they encounter different materials

True

Seismotologists have reasoned that Earth's outer core must be liquid based on the dissapearance of S-waves.

True

Studies of ow waves reflect deep inside Earth show that Earth's inner core is solid.

False

Surface waves are the first to arrive at a seismic facility

True

The P-wave shadow zone does not recieve direct P-waves

Seismometer

an instrument that records earthquake vibrations

Each whole number increase on the Ritcher scale corresponds to a 32 fold increase

seismic energy