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From largest to smallest, this hierarchy includes eons, eras, periods, epochs, and ages. ... The time before the Phanerozoic is usually referred to as the Precambrian and is usually divided into the three eons shown. The Phanerozoic is subdivided into three major divisions: the Cenozoic, Mesozoic, and Paleozoic Eras.

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From largest to smallest, this hierarchy includes eons, eras, periods, epochs, and ages. ... The time before the Phanerozoic is usually referred to as the Precambrian and is usually divided into the three eons shown. The Phanerozoic is subdivided into three major divisions: the Cenozoic, Mesozoic, and Paleozoic Eras.

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In physics and systems theory, the superposition principle, also known as superposition property, states that, for all linear systems, the net response caused by two or more stimuli is the sum of the responses that would have been caused by each stimulus individually.

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In physics and systems theory, the superposition principle, also known as superposition property, states that, for all linear systems, the net response caused by two or more stimuli is the sum of the responses that would have been caused by each stimulus individually.

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Replica casts are created by molding and then casting an original fossil so all of the detail is preserved, but the original is safely stored in a museum or other responsible collection. ... Sometimes replicas are made by reconstructing partial casts or by paleo-artists who sculpt fossils based on scientific references.

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Extrusive igneous rocks cool and solidify quicker than intrusive igneous rocks. They are formed by the cooling of molten magma on the earth's surface. The magma, which is brought to the surface through fissures or volcanic eruptions, solidifies at a faster rate.

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Extrusive igneous rocks cool and solidify quicker than intrusive igneous rocks. They are formed by the cooling of molten magma on the earth's surface. The magma, which is brought to the surface through fissures or volcanic eruptions, solidifies at a faster rate.

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Rock that has formed through the deposition and solidification of sediment, especially sediment transported by water (rivers, lakes, and oceans), ice ( glaciers ), and wind. Sedimentary rocks are often deposited in layers, and frequently contain fossils. Note :Limestone and shale are common sedimentary rocks.

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A metamorphic rock is a type of rock which has been changed by extreme heat and pressure. Its name is from 'morph' (meaning form), and 'meta' (meaningchange). The original rock gets heated (temperatures greater than 150 to 200 °C) and pressured (1500 bars). This causes profound physical and/or chemical change.

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a fossil of a footprint, trail, burrow, or other trace of an animal rather than of the animal itself.

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a fossil of a footprint, trail, burrow, or other trace of an animal rather than of the animal itself.

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Petrified fossils form when minerals replace all or part of an organism. Water is full of dissolved minerals. It seeps through the layers of sediment to reach the dead organism. When the water evaporates, only the hardened minerals are left behind.

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Cenozoic - the time we are currently in.

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Cenozoic - the time we are currently in.

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- The Neogene Period is also considered the start of human evolution. It was during thistime that the first human like ancestors, the hominids, appeared in Africa. They also moved into Europe and Asia during the Neogene Period. The final period in the Cenozoic Era, and the period we currentlylive in, is the

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Eras - Paleozoic, Cenozoic, and Mesozoic.

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Eras - Paleozoic, Cenozoic, and Mesozoic.

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The Eras are the next largest interval units into which the Geologic Time is divided and represented on the chart. Eras encompass major intervals of Time and aredefined based on the fossil life-forms found in the rock layers, and the Law of Superposition. ... The Paleozoic Era, the Mesozoic Era, and the Cenozoic Era.

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law of superposition. noun. Geology. a basic law of geochronology, stating that in any undisturbed sequence of rocks deposited in layers, the youngest layer is on top and the oldest on bottom, each layer being younger than the one beneath it and older than the one above it.

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Sedimentary Rock - fossils forms in this layer.

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Sedimentary Rock - fossils forms in this layer.

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With the passage of time and the accumulation of more particles, and often with chemical changes, the sediments at the bottom of the pile become rock.Gravel becomes a rock called conglomerate, sand becomes sandstone, mud becomes mudstone orshale, and the animal skeletons and plant pieces can become fossils

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A bug stuck in amber - Preserved Remains

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A bug stuck in amber - Preserved Remains

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An incredible array of amazing fossils have been discovered frozen in time. ... And because it is meant to protect a plant from predators, on occasion those organisms get stuck in the resin and frozen for millions of years, ... It may come as a surprise that insects, like humans, can care for their young.

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How old is the Planet Earth - Paleontologist believe it is 4.6 Billion Years Old

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How old is the Planet Earth - Paleontologist believe it is 4.6 Billion Years Old

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The third approach, and the one that scientists think gives the most accurate age for the Earth, the otherplanets, and the Solar System, is to determine model lead ages for ... The results from these methods indicate that the Earth, meteorites, the Moon, and, by inference, the entire Solar System are 4.5 to 4.6 billion years old.

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ry of rock and fossils - Geologic Time Scale

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ry of rock and fossils - Geologic Time Scale

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Fossils are fundamental to the geologic time scale. The names of most of the eons and eras end in zoic, because these time intervals are often recognized on the basis of animal life. Rocks formed during the Proterozoic Eon may have fossils of relative simple organisms, such as bacteria, algae, and wormlike animals.

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Relative Dating of rock layers tells us that the deeper we dig - the older the rock gets.

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Relative Dating of rock layers tells us that the deeper we dig - the older the rock gets.

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the older the rock gets the harder gets

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Fossil is an impression left by the original organism - mold 

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Fossil is an impression left by the original organism - mold 

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A mold is the impression and void (space, hole) that an organism or organism's body or body part leaves in the sediment. ... A cast is made of different material than amold. Both casts and molds are types of fossils. Sometimes the mold and cast are found together, although molds are more than casts.

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A fossil trackway is a type of trace fossil, a trackway made by an organism. ... Marine organisms also made many ancient trackways (such as the trails of trilobites and eurypterids like Hibbertopterus). Some basic fossil trackway types: footprints. tail drags.

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In geology, petrifaction or petrification is the process by which organic material becomes a fossil through the replacement of the original material and the filling of the original pore spaces with minerals

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mold-fossil. Noun. (plural mold fossils) A fossilformed when an animal, plant, or other organism dies and is covered by sediment, its flesh decays and bones deteriorate due to chemical reactions, and a cavity remains below the ground surface.

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In physics and systems theory, the superposition principle, also known as superposition property, states that, for all linear systems, the net response caused by two or more stimuli is the sum of the responses that would have been caused by each stimulus individually.

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slideplayer.com

Uniformitarianism is defined in the authoritative Glossary of Geology as "the fundamental principle or doctrine that geologic processes and natural laws now operating to modify the Earth's crust have acted in the same regular manner and with essentially the same intensity throughout geologic time, and that past