How many seismograph stations are needed to locate the epicenter of an earthquake?

Which theory suggested that the earth was once a signle supercontient that gradually that broke up into the contients that we know today

Paraguay is one of the only two countries in the americas that don't have a coastal border. the country is slightly smaller than california. it was under a military dictatorship for 35 years, ending in 1989; today it is a constitutional republic. most of the population is roman catholic, and over 60% of the people live in cities. its environment is threatened by deforestation and water pollution. which of the following facts from the paragraph above best describes an element of paraguay's culture? (apex)

Which of the following statements about wearher along mountain ranges is correct