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astron_ch_7c (1)
astron_ch_7c (1)

... granite (3 g/cm ) which can float on the mantle. ...
Science Chapter 4 Study Guide Vocabulary
Science Chapter 4 Study Guide Vocabulary

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SGM3DP01 - Finding And Using Rocks

... located under the crust. The rock in this layer is quite thick and can be very hot. ...
Earth Science - Gilbert Public Schools
Earth Science - Gilbert Public Schools

... • If the geosphere is mostly sand how does it effect the biosphere? • Is the geosphere mostly sand due to what happens in the ...
The Interior of the Earth
The Interior of the Earth

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Name: Structure of the Earth and Plate Tectonics – Study Guide 1
Name: Structure of the Earth and Plate Tectonics – Study Guide 1

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learning targets for

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Earth science SOL Review

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Flashcards review for Study Blue

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... The extreme pressure and heat from the Earth can cause materials in the Earth to move or shift. This heat and pressure cause large continent-sized blocks called plates to move slowly about the Earth’s surface. They are not connected to one another, but move freely about. These plates can bump, push, ...
Ossana plate tectonics
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... all of the matter that created the Earth fell together, it picked up kinetic energy falling in. When it stopped at the proto-Earth, the kinetic energy was turned into heat. The Earth hasn't cooled yet. But, the vast majority of the heat in Earth's interior—up to 90 percent—is fueled by the decaying ...
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... Yosemite’s Half Dome, part of the Sierra Nevada mountain chain. ...
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Unit 7 Earth`s Resources

... Overarching Concept: 9.7 - Elements on Earth move among reservoirs in the solid earth, oceans, atmosphere and organisms as part of biogeochemical cycles.  Elements on Earth exist in essentially fixed amounts and are located in various chemical reservoirs.  The cyclical movement of matter between r ...
to the PDF
to the PDF

... 5. We now know that the earth’s solid surface is made up of about 12 plates which move around as a result of convection currents in the semi-molten rock underneath them. Heat is being generated by natural radioactivity deep in the earth to keep this process of movement continuing. 6. If the contine ...
Landforms - Rankin County School District / Homepage
Landforms - Rankin County School District / Homepage

... – Physical- heating and cooling, freezing and thawing, roots of trees- breaks or cracks the surface ...
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Age of the Earth



The age of the Earth is 4.54 ± 0.05 billion years (4.54 × 109 years ± 1%). This age 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.Following the development of radiometric age dating in the early 20th century, measurements of lead in uranium-rich minerals showed that some were in excess of a billion years old.The oldest such minerals analyzed to date—small crystals of zircon from the Jack Hills of Western Australia—are at least 4.404 billion years old. Comparing the mass and luminosity of the Sun to those of other stars, it appears that the Solar System cannot be much older than those rocks. Calcium-aluminium-rich inclusions – the oldest known solid constituents within meteorites that are formed within the Solar System – are 4.567 billion years old, giving an age for the solar system and an upper limit for the age of Earth.It is hypothesised that the accretion of Earth began soon after the formation of the calcium-aluminium-rich inclusions and the meteorites. Because the exact amount of time this accretion process took is not yet known, and the predictions from different accretion models range from a few millions up to about 100 million years, the exact age of Earth is difficult to determine. It is also difficult to determine the exact age of the oldest rocks on Earth, exposed at the surface, as they are aggregates of minerals of possibly different ages.
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