tag:blogger.com,1999:blog-31470899847403393752024-03-13T09:49:06.355-07:00Source RocksThe Present Is The Key To The PastErwanhttp://www.blogger.com/profile/10283819966276721486noreply@blogger.comBlogger14125tag:blogger.com,1999:blog-3147089984740339375.post-76614879355181976182010-04-30T10:22:00.000-07:002010-04-30T10:25:24.524-07:00Types of Volcanic EruptionsVolcanic eruptions, especially explosive ones, are very dynamic phenomena. That is the behavior of the eruption is continually changing throughout the course of the eruption. This makes it very difficult to classify volcanic eruptions. Nevertheless they can be classified according to the principal types of behavior that they exhibit. An important point to remember, however, is that during a givenErwanhttp://www.blogger.com/profile/10283819966276721486noreply@blogger.com1tag:blogger.com,1999:blog-3147089984740339375.post-18826286788995792132010-04-30T09:44:00.000-07:002010-04-30T09:44:37.195-07:00Volcanic EruptionsVolcanic EruptionsIn general, magmas that are generated deep within the Earth begin to rise because they are less dense than the surrounding solid rocks.
As they rise they may encounter a depth or pressure where the dissolved gas no longer can be held in solution in the magma, and the gas begins to form a separate phase (i.e. it makes bubbles just like in a bottle of carbonated beverage Erwanhttp://www.blogger.com/profile/10283819966276721486noreply@blogger.com0tag:blogger.com,1999:blog-3147089984740339375.post-10341902913085105662010-04-30T09:24:00.000-07:002010-04-30T09:35:47.125-07:00Bowen's Reaction SeriesBowen found by experiment that the order in which minerals crystallize from a basaltic magma depends on temperature. As a basaltic magma is cooled Olivine and Ca-rich plagioclase crystallize first. Upon further cooling, Olivine reacts with the liquid to produce pyroxene and Ca-rich plagioclase react with the liquid to produce less Ca-rich plagioclase. But, if the olivine and Ca-rich plagioclase Erwanhttp://www.blogger.com/profile/10283819966276721486noreply@blogger.com0tag:blogger.com,1999:blog-3147089984740339375.post-74782987763229691102010-04-14T19:39:00.000-07:002010-04-14T19:39:53.109-07:00Karst TopographyThe degree of development of karst landforms varies greatly from region to region. Large drainage systems in karst areas are likely to have both fluvial (surface) and karst (underground) drainage components. As stated in the introduction, the term karst describes a distinctive topography that indicates dissolution of underlying rocks by surface water or ground water. Water falls as rain or snow Erwanhttp://www.blogger.com/profile/10283819966276721486noreply@blogger.com0tag:blogger.com,1999:blog-3147089984740339375.post-11377936718034872392010-04-14T18:46:00.000-07:002010-04-14T18:46:29.790-07:00KarstThroughout the world karst landscapes vary from rolling hills dotted with sinkholes, as found in portions of the central United States, to jagged hills and pinnacle karst found in the tropics. The development of all karst landforms requires the presence of rock which is capable of being dissolved by surface water or ground water.
The term karst describes a distinctive topography that indicates Erwanhttp://www.blogger.com/profile/10283819966276721486noreply@blogger.com1tag:blogger.com,1999:blog-3147089984740339375.post-31496035450383852742010-04-12T21:31:00.000-07:002010-04-12T21:31:28.262-07:00Fundamental of Coal PetrologyOrigin of Peat (Peat)
The coal is generally derived from peat (peat) deposits in a swamp. Important factors in the formation of peat:Evolution of floral development
Climate
Geography and regional structures
Evolution of Flora Development
The oldest coal-old from Michigan Central Hurorian derived from algae and fungi. While in the Lower and Upper Devonian era, mostly from coal Psilophites (spt: Erwanhttp://www.blogger.com/profile/10283819966276721486noreply@blogger.com0tag:blogger.com,1999:blog-3147089984740339375.post-66068573274806571722010-04-12T21:17:00.000-07:002010-04-12T21:17:29.287-07:00Metamorf RockDefinition
Metamorfosisme process is a process that causes changes in mineral composition, texture and structure on the rocks because of heat and high pressure, as well as the active chemical solution. The end result of the process metamorfisme is metamorphic rock. So rocks are igneous rocks formed by processes metamorfisme on pre-existing rocks. Rock (which had existed previously) can be igneousErwanhttp://www.blogger.com/profile/10283819966276721486noreply@blogger.com0tag:blogger.com,1999:blog-3147089984740339375.post-54743775197602506642010-04-12T09:43:00.000-07:002010-04-12T21:20:41.948-07:00Sedimentary RocksRocks are sedimentary rocks formed from the accumulation of material reshuffle results pre-existing rocks or the result of chemical activity or organism, which was deposited layer by layer on the surface of the earth which then harden.
(Pettjohn, 1975)
So many kinds of sedimentary rocks and spread out very wide with a thickness between a few centimetersampai several kilometers. Also butirnya Erwanhttp://www.blogger.com/profile/10283819966276721486noreply@blogger.com0tag:blogger.com,1999:blog-3147089984740339375.post-18732643747245127802010-04-12T04:32:00.000-07:002010-04-12T21:19:45.494-07:00Frozen RockMagma can be cooled and frozen at or below the earth's surface. When frozen beneath the earth's surface, forming igneous rock called in or called intrusive igneous rocks (often also described as igneous plutonic). Whereas, if the magma can reach the earth's surface and then freezes, forming the outside or igneous extrusive igneous rock.
Rocks Frozen In
The frozen magma beneath the earth's Erwanhttp://www.blogger.com/profile/10283819966276721486noreply@blogger.com0tag:blogger.com,1999:blog-3147089984740339375.post-76039015117440960652010-04-12T04:18:00.000-07:002010-04-12T21:23:10.608-07:00PetrologyPetrology is a field of geology which focuses on the study of rocks and its formation conditions. There are three branches of petrology, associated with three types of rocks: frozen, metamorphic, and sedimentary. Petrology word itself comes from the Greek word petra, meaning "stone."Igneous petrology focuses on the composition and texture of igneous rocks (like granite or basalt rock that has Erwanhttp://www.blogger.com/profile/10283819966276721486noreply@blogger.com0tag:blogger.com,1999:blog-3147089984740339375.post-25803497082718123862010-04-11T21:13:00.000-07:002010-04-12T21:21:18.694-07:00Magma DifferentiationMagma is liquid or incandescent silicate solution that is formed naturally, with temperatures of between 9000 to 11,000 C and derived from the crust bottom or top of the envelope of the earth (Vide FFGrouts, 1947: Turner & Verheogan, 1960: H. Williams, 1962).
Natural silicate magma as a solution containing all the ions that would form all rock-forming minerals, but minerals are not formed Erwanhttp://www.blogger.com/profile/10283819966276721486noreply@blogger.com0tag:blogger.com,1999:blog-3147089984740339375.post-77130464822707936102010-04-11T20:58:00.000-07:002010-04-12T21:22:54.529-07:00Rock CyclePreviously, we already know that on earth there are three types of rocks are igneous rocks, sedimentary rocks, and metamorphic rocks. Third rock can change into metamorphic rocks, but they also can turn into other rocks. All rocks will experience weathering and erosion into the particles or fragments smaller could also eventually form sedimentary rocks. Rocks can also melt, or melt into magma andErwanhttp://www.blogger.com/profile/10283819966276721486noreply@blogger.com0tag:blogger.com,1999:blog-3147089984740339375.post-46798639629329919752010-04-11T20:53:00.000-07:002010-04-12T21:22:28.846-07:00The occurrence of Earth hypothesis in the Solar SystemOur Earth formed about 4.6 billion years ago along with the formation of a solar system called the solar family. One theory, called "Theory of Fog (Nebula) tells what happened in the 3 (three) phases:
The sun and other planets still a gas, the fog was so thick and big
Fog is spinning and twisting with a strong, where compaction occurs at the center of the circle which then form the sun. AtErwanhttp://www.blogger.com/profile/10283819966276721486noreply@blogger.com1tag:blogger.com,1999:blog-3147089984740339375.post-45905612208176358862009-02-27T06:52:00.000-08:002011-02-27T07:14:08.339-08:00Sitemap Tutup | Buka | Buka Tutup
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