Question

look at the seismograph below. what type of wave does letter b represent? surface secondary primary

Explanation:

On a seismograph, primary waves (P - waves) arrive first, followed by secondary waves (S - waves), and then surface waves. In the given seismograph, letter A represents the first - arriving waves (P - waves). Letter B represents the second - arriving waves. Since S - waves (secondary waves) are the second type of body waves to be detected on a seismograph after P - waves.

Answer:

Secondary