If an S wave travels at 4 km/s to reach a seismic station 1200 km away, how much longer will secondary waves arrive after the primary waves?

Types of scientific inquiry that biologist engage in that cannot be completely controlled

What is the starting point in replication called

Homo heidelbergensis was a tall, muscular hunter, who used both tools and weapons. because h. heidelbergensis was not a gatherer/forager, but ate a varied diet including meat and fish, we would expect to see what anatomical changes?