Flashcards › Soil and Geologic Time Review

What era is the Cambrian period in? Paleozoic What era is the Triassic period in? Mesozoic What era is the Carboniferous period in? Paleozoic What era is the Tertiary period in? Cenozoic What era is the Quaternary period in? Cenozoic What era is the Permian period in? Paleozoic What era is the Devonian period in? Paleozoic What era is the Jurassic period in? Mesozoic What era is the Cretaceous period in? Mesozoic What era is the Silurian period in? Paleozoic What era is the Ordovician period in? Paleozoic fossil the preserved remains or traces of living things trace fossil type of fosil that provides evidence of the activities of ancient organisms petrified fossil fossils in which minerals replace all or part of an organism preserved remains organism that was trapped in ice or amber era long unit of geologic time, 3 so far: Paleozoic, Mesozoic, and Cenozoic index fossil help geologists match rock to layers soil is the loose, weathered material on Earth's surface in which plants can grow permeable means that a material is full of tiny, connected air spaces that allow water to seep through it amphibian is an cold-blooded vertebrate that lives part of its life on land and part of its life in water evolution is the gradual change in living things over long periods of time intrusion where magma cools and hardens into a mass of igneous rock extrusion lava that hardens on the surface Law of Superposition states that in horizontal rock, rock that is on the bottom is the oldest half-life is the time it takes for half of the radioactive atoms to decay decomposers the organisms that break the remains of dead organisms into smaller pieces and digest them with chemicals humus is a dark-colored substance that forms as plant and animal remains decay reptile is a cold-blooded vertebrate that has scaly skin and lays eggs with tough leathery shells mammal is a warm-blooded vertebrate that feeds its young milk invertebrate animals without backbones vertebrate is an animal with a backbone period subdivision of era, subdivided into epochs radioactive decay process in which elements decay by releasing particles and energy paleontologist scientist who studies fossils What was the main occurrence during Precambrian Time? there was an explosion of life What were the main organisms during the Mesozoic Era? dinosaurs What is the main organism in the Cenozoic Era? humans evolve Fill in the Blank: Fossils form and become buried by _______ . sediments What does radioactive dating determine? absolute age What was the main occurrence during the Paleozoic Era? Pangaea began to break apart