Answer:
S wave, P wave, Surface wave.
Explanation:
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The correct answer to public libraries response to to patrons’ increasing desire for e-books is; made a proactive change
<h3>What are proactive changes?</h3>
From the question we see that the public libraries have observed that patrons were now liking e-books more than print books. Thus, they are seeking to use technology to allow people to check out books on their mobile devices.
Now, this attitude of public libraries to allow patrons check out books on their mobile device is called being proactive. Thus, we can say that they made a proactive change by making changes in advance to suit the priorities of the users.
Read more about changes at; brainly.com/question/2147899
