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7.3 Landforms are the result of the interaction of constructive and
7.3 Landforms are the result of the interaction of constructive and

... constantly changing result of dynamic processes and forces at work inside the Earth. 2. Earth is formed of three basic layers, with the densest being the iron and nickel core. The middle layer, the mantle, of the Earth is composed of mostly light elements such as silicon, oxygen and magnesium and is ...
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Ch 3, part 1

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Evidence for a Plate Tectonics Debate - IG

... Although our planet Earth has been around for more than four billion years, in our vision it would never be the same after 1912. In that year, Alfred Wegener, a German astronomer and meteorologist, often on scientific expeditions to Greenland, first proposed that the continents had drifted apart fro ...
Scientists who aided theory of Evolution PPT
Scientists who aided theory of Evolution PPT

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Plate Tectonics

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... the crust: Is the earth skin- like the peel of an orange. Beneath the crust is a thick layer, called the mantle, made of mostly solid rock which subjected to enough heat and pressure. • The Earth crust is cracked into huge pieces that fit together like a giant puzzle. These pieces are called plates ...
The Layers of the EarthPowerPoint Fill-in-the
The Layers of the EarthPowerPoint Fill-in-the

Read the following about the layers of the Earth and answer the
Read the following about the layers of the Earth and answer the

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Chapter 3 Study Guide!!

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Lecture 2 Notes: Origin and Age of the Earth

... 3. Now we have all the elements, but how do we parse them up into sun, planets, moons, etc.? The starting point was a haze of very diffuse matter produced by the above processes. How do we know? The abundance of elements in the Sun and in one of the most primitive (i.e. least changed) meteorite clas ...
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learning targets for

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Z SR Midterm Test Review
Z SR Midterm Test Review

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Purpose, Standards and Prelesson

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Homework01h - Kean University
Homework01h - Kean University

... 2. What happens to the volume and density of any substance when it is heated? 3. If a low density ("light") substance is surrounded by high density ("heavy") materials, which moves to the lower level? 4. What happens to the volume and density of any substance when it is cooled? 5. What is convection ...
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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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