2. The P-wave arrived at 16:17:20 pm and the S-wave arrived at 16:19:00 pm at the seismograph recording station. What is the distance to the epicenter?

Which of the following best describes the purpose of a nation’s boundaries? a. to limit the movement of goods and people b. to make it easier for cartographers to create maps c. to make the movement of goods and people easier d. to prevent other countries from invading territory