Earth's craters are enduring testaments to direct asteroid hits. And though millionsâin some cases billionsâof years of erosion have made it difficult to determine the exact size of the meteorites, there is a general scientific consensus around the world's largest craters, which mark the largest asteroid impacts. Here are the ten biggest known: 1. Vredefort Crater.
Quick Answer. Tiger sharks have a row of 24 teeth in their upper jaw and a matching set of 24 teeth in the lower jaw, totaling 48 teeth. Tiger sharks have a square jaw structure, and each of their teeth are built with cutting and sawing mechanisms. Continue Reading.
Joe Chernov and Robin Richards have created an infographic that illustrates the staggering number of sharks killed by humans every year. According to the infographic, sharks killed 12 people last year, but humans kill that many sharks every four seconds, adding up to an estimated total of 100 million sharks annually. Many sharks are killed by 'finning,' a process in which a shark's fins are cut off to be sold for shark fin soup.