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Answers for "175 Things to know for the 2016 midterm"
Answers for "175 Things to know for the 2016 midterm"

... 110. How many seismic stations do you need to find the epicenter of a quake? 3 111. Describe how to find the distance to the epicenter if you know the s-wave travel time? Use travel time graph in ESRT. Find S wave travel time on y axis, go across to s wave curve, drop down to read distance. 112. Des ...
Midterm Review Questions - Red Hook Central Schools
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Continental drift and a theory of convection
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... Thus they provided a basis for evolution. They made discoveries of great economic importance and correctly concluded that the surface rocks are rigid and brittle. By 1850 they had become leaders among the world’s scientists. Since no means had been found to investigate the deep interior in detail, m ...
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The Geological Time Scale
The Geological Time Scale

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http://ict.aiias.edu/vol_26B/26Bcc_179-199.pdf
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... is an alteration front, as Harry Hess once supposed, at least in this one spot in the ocean. And we did, with our British and Canadian colleagues, map out an enormous block of gabbro over the top of the bank—proving that the crust here is relatively intact and not a great tectonic jumble. But we als ...
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Geological history of Earth



The geological history of Earth follows the major events in Earth's past based on the geologic time scale, a system of chronological measurement based on the study of the planet's rock layers (stratigraphy). Earth formed about 4.54 billion years ago by accretion from the solar nebula, a disk-shaped mass of dust and gas left over from the formation of the Sun, which also created the rest of the Solar System.Earth was initially molten due to extreme volcanism and frequent collisions with other bodies. Eventually, the outer layer of the planet cooled to form a solid crust when water began accumulating in the atmosphere. The Moon formed soon afterwards, possibly as the result of a Mars-sized object with about 10% of the Earth's mass impacting the planet in a glancing blow. Some of this object's mass merged with the Earth, significantly altering its internal composition, and a portion was ejected into space. Some of the material survived to form an orbiting moon. Outgassing and volcanic activity produced the primordial atmosphere. Condensing water vapor, augmented by ice delivered from comets, produced the oceans.As the surface continually reshaped itself over hundreds of millions of years, continents formed and broke apart. They migrated across the surface, occasionally combining to form a supercontinent. Roughly 750 million years ago, the earliest-known supercontinent Rodinia, began to break apart. The continents later recombined to form Pannotia, 600 to 540 million years ago, then finally Pangaea, which broke apart 180 million years ago.The present pattern of ice ages began about 40 million years ago, then intensified at the end of the Pliocene. The polar regions have since undergone repeated cycles of glaciation and thaw, repeating every 40,000–100,000 years. The last glacial period of the current ice age ended about 10,000 years ago.
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