With an estimated population of 1,381,069 as of July 1, 2014, San Diego is the eighth-largest city in the United States and second-largest in California. It is part of the San Diego–Tijuana conurbation, the second-largest transborder agglomeration between the US and a bordering country after Detroit–Windsor, with a population of 4,922,723 people. San Diego is the birthplace of California and is known for its mild year-round climate, natural deep-water harbor, extensive beaches, long association with the United States Navy and recent emergence as a healthcare and biotechnology development center. COUNT 5
QSN1 Which city in Mexico does San Diego border? ANS1 Tijuana QSN2 Aside from healthcare, which employment sector has strongly emerged in San Diego? ANS2 biotechnology development QSN3 Of all military branches, which one has the strongest presence in San Diego? ANS3 United States Navy QSN4 What is unique about San Diego's harbors? ANS4 deep-water QSN5 Of the top 10 largest cities in the country, which place does San Diego rank? ANS5 eighth