Why carbon-14 dating doesn't yield exact results
By: Tim Harry
Carbon-14 is a radioactive isotope of carbon, and is as a result often used in to date archaeological finds. The presence of Carbon-14 in all organic material (including wood, textiles and bones) comes about because of the bombardment of the atmosphere by cosmic rays, which...
Facts about chemical sedimentary rocks
By: Retha Boswell
Sedimentary rocks are created when particulates accumulate and are consolidated into rock. Chemical sedimentary rocks are a special type of sedimentary rock formed from chemical reactions. These rocks are made when materials dissolved in water precipitate and later harden with the other matter particles. This...
Compositional changes in metamorphic rocks
By: Retha Boswell
Metamorphic rocks are rocks that have been changed by heat, pressure, chemicals, or any combination thereof. The original rocks are transformed into new types of rocks. Igneous, sedimentary, and older metamorphic rocks can undergo metamorphism. The changes the rocks experience are in texture and composition...
Causes of metamorphism
By: Retha Boswell
Metamorphism in geology is when one type of rock is transformed into another type of rock called a metamorphic rock. The word metamorphic comes from the Greek words meaning "change" and "form." There are two main factors that can cause the conversion: heat, pressure...
Causes of metamorphism
By: Kimberly Napier
Metamorphism is when minerals recrystallize in pre-existing, parent, igneous or sedimentary rock. Pressure, temperature, fluids or deformations are some of the causes of this change. It can also occur when the rocks are buried or dragged by an active lithosphere, then brought back to the...
By: Retha Boswell
Heat, pressure, and chemical processes can alter rocks, changing them into a new type of rock known as a metamorphic rock. Igneous, sedimentary, as well as older metamorphic rocks can be transformed into metamorphic rocks. “Metamorphic” comes from the Greek words for “change&rdquo...
By: Kimberly Napier
The metamorphosis of rocks generally occurs under pressure and high temperatures. When exposed to these conditions the composition of the rock can also change. There are other conditions that can change the composition of the rock as well. When gases, hot liquids and pressures are...
Importance of sedimentary rocks
By: Retha Boswell
Sedimentary rocks have a wide variety of uses, making them extremely important. Types of sedimentary rocks have surprising physical, everyday uses and uses in construction. They are also useful to geologists and other scientists with interest in studying the earth. Organic sedimentary rocks, like coal...
Rocks formed from evaporation
By: Retha Boswell
Many types rocks are formed by evaporation. They are referred to either as evaporites or chemical sedimentary rocks. They form in dry climates where the water can rapidly evaporate leaving sediment behind to precipitate. Evaporites are divided into two groups: marine and non-marine evaporites. Gypsum...
Texture groups of metamorphic rocks
By: Retha Boswell
Metamorphic rocks are classified into one of two groups based on their texture. They are either foliated or non-foliated (also known as granular). In general, foliated metamorphic rocks have distinguishable bands of color or layers of different minerals, while granular metamorphic rocks are uniformly composed...

 

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