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How Sedimentary Rock Is Formed? |
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Written by Admin.G.M
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Thursday, 17 July 2008 01:44 |
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For thousands, even millions of years, little pieces of our earth have been eroded--broken down and worn away
by wind and water. These little bits of our earth are washed downstream where they settle to the bottom of the rivers, lakes, and oceans. Layer after layer of eroded earth is deposited on top of each. These layers are pressed down more and more through time, until the bottom layers slowly turn into rock. for example |
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How Igneous Rock Is Formed |
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Written by Admin.G.M
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Tuesday, 17 June 2008 00:28 |
For thousands, even millions of years, little pieces of our earth have been eroded--broken down and worn away
by wind and water. These little bits of our earth are washed downstream where they settle to the bottom of the rivers, lakes, and oceans. Layer after layer of eroded earth is deposited on top of each. These layers are pressed down more and more through time, until the bottom layers slowly turn into rock. For example |
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Last Updated on Tuesday, 17 June 2008 00:34 |
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How Metamorphic Rock Is Formed? |
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Written by Admin.G.M
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Tuesday, 17 June 2008 00:21 |
Metamorphic rocks are rocks that have "morphed" into another kind of rock. These rocks were once igneous or sedimentary rocks. How do sedimentary and igneous rocks change? The rocks are under tons and tons of pressure, which fosters heat build up, and this causes them to change. If you exam metamorphic rock samples closely, you'll discover how flattened some of the grains in the rock are For example |
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Last Updated on Tuesday, 17 June 2008 00:25 |
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Written by Admin.G.M
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Monday, 16 June 2008 22:56 |
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Paleontology, palaeontology or palæontology (from Greek: παλαιό (palaeo), "old, ancient"; όν (on), "being"; and logos, "speech, thought") is the study of prehistoric life forms on Earth through the examination of fossils.[1] This includes the study of body fossils, tracks (ichnites), burrows, cast-off parts, fossilised faeces (coprolites), palynomorphs and chemical residues. Studies of prehistoric hominins, their culture and their behaviour are the purview of two other disciplines, archaeology and paleoanthropology. |
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Last Updated on Wednesday, 09 July 2008 03:43 |
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Introduction to Stratigraphy |
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Written by Admin.G.M
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Monday, 16 June 2008 15:58 |
Concept
Stratigraphy is the study of rock layers (strata) deposited in the earth. It is one of the most challenging of geologic subdisciplines, comparable to an exacting form of detective work, yet it is also one of the most important branches of study in the geologic sciences. Earth's history, quite literally, is written on the strata of its rocks, and from observing these layers, geologists have been able to form an idea of the various phases in that long history. Naturally, information is more readily discernible about the more recent phases, though even in studying these phases, it is possible to be misled by gaps in the rock record, known as unconformities. |
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