3 Petrified tree sap = amber (Basis for Jurassic Park movies)
Fossil Evidence In 2004, scientists digging in the Canadian Arctic unearthed fossils of a half-fish, half- amphibian that all but confirmed paleontologists' theories about how land- dwelling tetrapods–four-limbed animals, including us–evolved from fish. It is a classic example of a transitional form, one that bridges a so-called evolutionary gap between different types of animal. Lets examine five important cases. 4
Age-determining Techniques Biological – tree rings Geologic – sedimentary layers Geochemical – Sea salt concentration Geophysical – Relative cooling of earths crust Chemical – Weathering Relative dating – Fossil relations Radioactive dating – Comparative amount of elements 11
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