In the Seismic refraction method, the _______ waves are picked up by Geophone.
Thermometer
Wave buoy
Radiating shock
Seismic waves travel faster through less dense material.
True
False
Earth has a layered structure is where seismic waves suddenly change paths when _________.
The density abruptly changes
Travel in straight lines
Refraction abruptly changes
________ is used to record seismic waves.
Seisnoneter
Seismograph
Seismonomer
Earth's mantle's density increases with depth which extends almost halfway to the center of the Earth.
True
False
How are P waves?
Ultrasonic
Electromagnetic
Longitudinal
Seismic waves are caused by ______.
Volcanoes
Earthquakes
Thunder
The geophone cannot detect seismic refraction in a blind zone.
True
False
The cone resistance is approximately equal to ______ times the penetration resistance N.
10
50
90
The base of the cone is _______ cm in diameter in the Dutch cone test.
6.6
4.6
3.6
The cone test is very useful in ________ soils.
Cohesion-less
Cohesive
Silty clay
Are S waves Ultrasonic?
Yes
No
S waves travel through ________.
Solids
Liquids
Both
The speed of S waves and P waves cannot be recorded.
True
False
________ are caused when the earth's plates rub together.
Earthquakes
Traffic
Rain
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