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The geologic time scale (GTS) is a system of chronological dating that relates geological strata (stratigraphy) to time. It is used by geologists, paleontologists, and other Earth scientists to describe the timing and relationships of events that have occurred during Earth's history.

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The geologic time scale (GTS) is a system of chronological dating that relates geological strata (stratigraphy) to time. It is used by geologists, paleontologists, and other Earth scientists to describe the timing and relationships of events that have occurred during Earth's history.

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an allegory with many strata of meaning. 3. Geology. a single bed of sedimentary rock, generally consisting of one kind of matter representing continuous deposition.

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an allegory with many strata of meaning. 3. Geology. a single bed of sedimentary rock, generally consisting of one kind of matter representing continuous deposition.

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The Rock Cycle is a group of changes. Igneous rock can change into sedimentary rock or into metamorphic rock. Sedimentary rock can change into metamorphic rock or into igneous rock. Metamorphic rock can change into igneous or sedimentary rock. Igneous rock forms when magma cools and makes crystals.

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The Rock Cycle is a group of changes. Igneous rock can change into sedimentary rock or into metamorphic rock. Sedimentary rock can change into metamorphic rock or into igneous rock. Metamorphic rock can change into igneous or sedimentary rock. Igneous rock forms when magma cools and makes crystals.

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the remains or impression of a prehistoric organism preserved in petrified form or as a mold or cast in rock.

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the remains or impression of a prehistoric organism preserved in petrified form or as a mold or cast in rock.

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The history of Earth concerns the development of planet Earth from its formation to the present day. Nearly all branches of natural science have contributed to the understanding of the main events of Earth's past. The age of the Earth is approximately one-third of the age of the universe.

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The history of Earth concerns the development of planet Earth from its formation to the present day. Nearly all branches of natural science have contributed to the understanding of the main events of Earth's past. The age of the Earth is approximately one-third of the age of the universe.

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For example, the half-life of a radioactive substance is the amount of time it takes for half of its atoms to decay, and the half-life of a drug is the amount of time it takes before half of the active elements are either eliminated or broken down by the body.

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For example, the half-life of a radioactive substance is the amount of time it takes for half of its atoms to decay, and the half-life of a drug is the amount of time it takes before half of the active elements are either eliminated or broken down by the body.

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half life definition earth science - Google Search

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a method of dating geological or archeological specimens by determining the relative proportions of particular radioactive isotopes present in a sample.

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a method of dating geological or archeological specimens by determining the relative proportions of particular radioactive isotopes present in a sample.

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radiometric dating definition - Google Search

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radiocarbon dating definition - Google Search

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radioactive decay. (rā'dē-ō-āk'tĭv) The spontaneous transformation of an unstable atomic nucleus into a lighter one, in which radiation is released in the form of alpha particles, beta particles, gamma rays, and other particles.

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radioactive decay. (rā'dē-ō-āk'tĭv) The spontaneous transformation of an unstable atomic nucleus into a lighter one, in which radiation is released in the form of alpha particles, beta particles, gamma rays, and other particles.

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The age of the Earth is approximately 4.54 ± 0.05 billion years (4.54 × 109 years ± 1%). This dating is based on evidence from radiometric age-dating of meteorite material and is consistent with the radiometric ages of the oldest-known terrestrial and lunar samples.

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The age of the Earth is approximately 4.54 ± 0.05 billion years (4.54 × 109 years ± 1%). This dating is based on evidence from radiometric age-dating of meteorite material and is consistent with the radiometric ages of the oldest-known terrestrial and lunar samples.

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the chemical element of atomic number 80, a heavy silvery-white metal that is liquid at ordinary temperatures.the column of mercury in a thermometer or barometer, or its height as indicating atmospheric temperature or pressure.

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the chemical element of atomic number 80, a heavy silvery-white metal that is liquid at ordinary temperatures.the column of mercury in a thermometer or barometer, or its height as indicating atmospheric temperature or pressure.

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Venus is the second planet from the Sun, orbiting it every 224.7 Earth days. It has the longest rotation period of any planet in the Solar System and rotates in the opposite direction to most other planets. It has no natural satellites.

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Venus is the second planet from the Sun, orbiting it every 224.7 Earth days. It has the longest rotation period of any planet in the Solar System and rotates in the opposite direction to most other planets. It has no natural satellites.

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Earth is the third planet from the Sun and the only object in the Universe known to harbor life. According to radiometric dating and other sources of evidence, Earth formed over 4 billion years ago. 

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Earth is the third planet from the Sun and the only object in the Universe known to harbor life. According to radiometric dating and other sources of evidence, Earth formed over 4 billion years ago. 

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Mars is the fourth planet from the Sun and the second-smallest planet in the Solar System after Mercury.

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Mars is the fourth planet from the Sun and the second-smallest planet in the Solar System after Mercury.

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What does Saturn trine Uranus mean? The answer depends on whether it’s an aspect occurring in your natal chart, currently forming in the cosmos (transit-to-transit aspect), transiting your chart, or occurring in a chart comparison (synastry – relationship astrology). However, this aspect between planets has common general themes. The following shows interpretations of Saturn trine Uranus in these various forms as well as in general.

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What does Saturn trine Uranus mean? The answer depends on whether it’s an aspect occurring in your natal chart, currently forming in the cosmos (transit-to-transit aspect), transiting your chart, or occurring in a chart comparison (synastry – relationship astrology). However, this aspect between planets has common general themes. The following shows interpretations of Saturn trine Uranus in these various forms as well as in general.

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Neptune is the eighth and farthest known planet from the Sun in the Solar System. In the Solar System, it is the fourth-largest planet by diameter, the third-most-massive planet, and the densest giant planet.

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Neptune is the eighth and farthest known planet from the Sun in the Solar System. In the Solar System, it is the fourth-largest planet by diameter, the third-most-massive planet, and the densest giant planet.