After an earthquake, scientists examine data from two different seismographs. The locations of the earthquake and the seismographs are labeled on the model of Earth. Seismograph 1 records P-waves and S-waves from the earthquake, but seismograph 2 only records P-waves. What causes the difference in seismic waves recorded by the two seismographs?

Amath expression is a collection of one or more terms, which are separated by the signs ( + , - , x , / ).example :   8+b8+b  or  a−3a−3in algebra, an equation is a mathematical statement with two expressions where, each expression is separated by an equal (=) sign. variables can be present on both the sides of the equality (=) sign and we use letters to denote such variables.example 1:   x=4+2x=4+2  , [here, we can observe that the variable is present only on one side of the equation].example 2:   2x+3=x+42x+3=x+4  , [here, we can observe that the variables are present on both side of the equation].

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Iwould choose c or d

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