Permian Period Volcanic Activity Volcanic Eruptions Ice Ages Triassic Period Mass Extinctions Continental Drift Earth's Formation Ordovician Period Mesozoic Era Paleozoic Era Paleogeography Cryogenian Period Jurassic Period Pleistocene Epoch Supercontinents Ice Age Cretaceous Period Impact Events Paleontology Hydrothermal Activity Earth's Geological Record Yellowstone Caldera Earth's History Phanerozoic Eon Granite Formations Formation of Earth Himalayan Formation Ancient Rivers Supercontinent Gondwana Paleoenvironment Landmark Evolution Ancient Earth Pangaea Triassic-Jurassic Transition Erosion Earth's Geological Timeline Icelandic Eruptions Ancient Rocks Seismic Events Geological Time Scale Lunar History Santorini Volcano Earth's Atmosphere Antarctic Glaciation Neoproterozoic Era Dinosaur Era Earth's Climate History Cambrian Period Dinosaur Evolution Glacier Retreat Miocene Epoch Paleoclimatology