Geomorphology, rock, rock cycle, geography, geography notes, weathering, erosion, mass movement, earth, relief features, igneous, metamorphic, sedimenatry ROCKS Sum or aggregate of one or more minerals is termed as rock. Igneous rocks are formed from the solidification of magma, which is a hot (600 to 1,300 °C, or 1,100 to 2,400 °F) molten or partially molten rock material. Crystals can form in the mass if cooling happens very slowly, allowing the natural geometrical shapes of the molecules to form. 1. It is either extrusive or intrusive and is the primary rock on the ocean floor. They are formed by cooling and solidification of magma from beneath the earth’s crust. Rocks are mostly classified into 3 forms. Extrusive Igneous Rocks. This is an exothermic process (it loses heat) and involves a phase change from the liquid to the solid state. Especially feldspar and quartz are two common minerals which are generally found in the rocks. The italics terms are for IFS only. Igneous Rocks. Igneous rocks. Compare and Contrast: Igneous, Metaorphic, and Sedimentary Rocks Types of Rock Sedimentary Igneous Metamorphic Images of the Three Types of Rocks Metamorphic Sedimentary Igneous Definitions Definitions Metamorphic Rock - Forms when pressure, temperature, or chemical processes The GK, General Studies, Optional notes for UPSC… Give examples for each. Deep-seated intrusive igneous rocks are called as Plutonic rocks and shallow depth intrusive igneous rocks are called as Hypabyssal Rocks. 2. Igneous rocks are crystalline solids which form directly from the cooling of magma. Click here for a detailed analysis on Geology Optional UPSC IAS and IFS Indian Forest Services Geology Optional Syllabus Paper 1 Paper 1 Section A. The extrusive igneous rocks are formed when the cooling of Lava occurs above the Earth's surface. Igneous rocks are often characterized by glassy texture, … The intrusive igneous rocks or plutonic rocks are formed when the Magma cools within the earth's crust. This video is highly rated by UPSC students and has been viewed 1 times. Body – Explain the origin, formation and characteristics of Igneous rocks along with its subtypes – Plutonic and Volcanic; sedimentary rocks and its subtypes – mechanically, organically and chemically formed sedimentary rocks and metamorphic rocks. Rocks that cool over millions of years have large pebble sized grains and are called plutonic. Basalt is dark and fine-grained with minerals rich in magnesium and iron. They are; Classification of Rocks. This is the combined syllabus for UPSC IAS and IFS Geology Optional. The upper 16 kilometers of the Earth’s crust is made up of 95% Igneous rock, with a thin covering of sedimentary and metamorphic rocks. That is, the mineral grains of intrusive igneous rocks are very large. Earth is composed predominantly of a large mass of igneous rock with a very thin veneer of weathered material—namely, sedimentary rock.Whereas sedimentary rocks … ; The earth is made of igneous rock – at least at the surface where our planet is exposed to the coldness … Sometimes the rocks become so soft, due to their exposure to environmental conditions for longer duration, that they can be easily … These rocks are hard and resistant. Granite and basalt make up the majority of igneous rocks. The formation of igneous rocks can take two routes: fast or slow. Igneous rocks are formed whe. #1. Eg: Granite, dolerite, etc. They are formed by the cooling of the lava on the … This cooling determines the chemical composition and structure of the rock. The characteristics of rocks directly influence the type of landforms generated. In this article we will discuss about the seven main characteristics of igneous rocks. Petrology is the science of rocks. 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