Did you know that until the 16th century, mariners and seamen referred to sharks as "sea dogs"? Sharks have actually been around for a long time--many scientists think a variation of the shark existed from over 420 million years ago! Sharks belong to a large group of fish that have a skeleton made of cartilage instead of bone. Because of this, the only fossilized remains of ancient sharks are their teeth.The teeth of sharks grow in constantly to replace older ones that wear out. It is estimated that sharks can lose up to 20,000 teeth in their lifetime. In fact, some ancient sharks had teeth that grew as long as 4 inches. Want a great example of a shark tooth fossil? Invest in this authentic shark tooth fossil specimen for your science classroom. Also makes a great gift for your favorite fossil collector!
Awesome fossil of a real shark tooth
Tooth is suspended in a rock chunk matrix
Great for displaying in your home or office
Also makes an excellent paperweight
Stimulate children’s interest in both marine biology and paleontology
Note: Please be aware that this is a natural fossil and as such each piece is one of a kind! The one you receive may not be exactly the same as the one pictured but it will be similar. Price is per each specimen. They come in irregular shapes, sizes and weights. Average size is between 0.75 inches to 1.5 inches in length.
Great reference card for chemistry and physics students.
Build 14 assorted solar robots, some of which can travel over water!
Discover a world of kaleidoscopic effects within this perfectly clear prism of the Light Crystal!
This smaller transportable Van de Graaff Generator will easily fit in any classroom!
See the constellations visible in the Northern Hemisphere on this watch!
Experience this sphere powered by the sun!
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