Petrology is the science of rocks. Igneous rocks are crystalline solids which form directly from the cooling of magma. The intrusive igneous rocks or plutonic rocks are formed when the Magma cools within the earth's crust. The italics terms are for IFS only. Igneous rocks. That is, the mineral grains of intrusive igneous rocks are very large. Give examples for each. They are formed by the cooling of the lava on the … 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. The landforms formed by the action of volcanoes and volcanic eruptions are known as volcanic landforms. This is the combined syllabus for UPSC IAS and IFS Geology Optional. 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 Basalt is dark and fine-grained with minerals rich in magnesium and iron. They are formed by cooling and solidification of magma from beneath the earth’s crust. The extrusive igneous rocks are formed when the cooling of Lava occurs above the Earth's surface. Extrusive Igneous Rocks. This cooling determines the chemical composition and structure of the rock. In this article we will discuss about the seven main characteristics of igneous rocks. (1) In all, the igneous rocks are roughly hard rocks and water percolates with great difficulty along the joints. Eg: Granite, dolerite, etc. ; The earth is made of igneous rock – at least at the surface where our planet is exposed to the coldness … 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. 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. Granite and basalt make up the majority of igneous rocks. Dec 08, 2020 - Rocks: Igneous, Sedimentary, Metamorphic & Rock Cycle UPSC Video | EduRev is made by best teachers of UPSC. 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. Deep-seated intrusive igneous rocks are called as Plutonic rocks and shallow depth intrusive igneous rocks are called as Hypabyssal Rocks. Igneous rocks are often characterized by glassy texture, … Igneous Rocks. 2. Rocks that cool over millions of years have large pebble sized grains and are called plutonic. This video is highly rated by UPSC students and has been viewed 1 times. They are; Classification of Rocks. These rocks are hard and resistant. Rocks are mostly classified into 3 forms. 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 scientific study of rocks … The formation of igneous rocks can take two routes: fast or slow. It is either extrusive or intrusive and is the primary rock on the ocean floor. 1. 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 … This is an exothermic process (it loses heat) and involves a phase change from the liquid to the solid state. #1. Especially feldspar and quartz are two common minerals which are generally found in the rocks. GK, General Studies, Optional notes for UPSC… Insights has redefined the way preparation is done in UPSC … Sometimes the rocks become so soft, due to their exposure to environmental conditions for longer duration, that they can be easily … The characteristics of rocks directly influence the type of landforms generated. Igneous rocks are formed whe. Happens very slowly, allowing the natural geometrical shapes of the Lava on ocean. Scientific study of rocks directly influence the type of landforms generated it is either or... 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