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.
Now lets take a look at how exactly shark teeth are fossilized. Depending on the species, sharks can go through as many as 50,000 or more teeth in their lifetime. If you've ever seen a shark's jaw before, you'll notice how they have rows upon rows of sharp, jagged teeth. When one of these teeth fall out, it usually goes to the bottom of the ocean floor and is replaced by a new one.