The Mesozoic Era begins at the end of the Permian Period Mass extinction had eliminated most of the species of life that had existed throughout the Paleozoic Era

Sedimentary rocks are classified as clastic, chemical, and organic sedimentary rocks The rocks in each group form by completely different processes

The Paleozoic Era is seen in the fossil record as an explosion of life forms The Cambrian Period marks the beginning of an era with thousands of new life forms in the ancient seas

Igneous…ignite And that’s just what happens when igneous rocks form