Explain how Opportunity Cost and Comparative Advantage helped to create international trade organizations. (4-5 sentences)

What role did the waterways of europe play in development of europe's economy

What is the general rule about surface currents? cold water flows along the ocean floor towards the equator. the east coasts of continents have cold surface currents, and the west coasts of continents have warm surface currents. seasonal and constant offshore winds create significant upwelling along the west coasts of south and north america and africa. the west coasts of continents have cold surface currents, and the east coasts of continents have warm surface currents.

What structure on the south african coast has a range of 63 km and releases flashes every 30 seconds?