By: Hai Shunxi
Mineral grains make up the building blocks of every kind of rock, whether it's a crumbling sandstone pebble or the smooth, polished granite of expensive countertops. Earth scientists use the minerals present to identify rock types, which is one part of the puzzle for defining...
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...
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...
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...
Causes of metamorphism
By: Francis Harris
Metamorphic rocks are one of three classes of rocks, distinguished from both sedimentary and igneous rocks, because of the way they form. The process that forms metamorphic rock is known as metamorphism, a word derived from the Greek "meta" and "morph", meaning "change/beyond" and "shape/form"...
Facts about chemical sedimentary rocks
By: Kimberly Napier
Chemical, or crystalline, sedimentary rocks contain mineral crystals that are made from dissolved water within them. These rocks are classified by the chemistry of the minerals. Their formation does not depend on any chemical or biochemical process. There are three common groups within chemical sedimentary...
Facts about metamorphic rocks
By: Francis Harris
Metamorphic rocks are formed when existing rocks (igneous, sedimentary or even other metamorphic rocks) are subject to agents of change. These causes of metamorphism such as heat more than 200C (but below the boiling point of the rock) and pressures higher than 300Mpa break down...

 

1 500 501 502 503 504 533