What have scientists learned from studying sesmic waves that travel through earths interior?

What is the northern most national park in the world

What would have happened to portugal’s trade if they had not found a way to sail around the tip of africa

Compared with the land in the highlands, the lowlands region of england a) rockier and more difficult for farmingb) the center of business and industryc)richer in coal reservesd)covered by more fertile farmland d) covered by more fertile farmland