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Geology

Geology

Geology “Geology is the science which is devoted to the study of the earth”. It deals with all the features of the earth’s surface and with the origin, composition, structure and inhabitants of the earth. Branches of Geology The field of geo is very large and it is divided into several branches. Physical Geo Physical geo is concerned with the work of natural processes which bring changes ... Read More »

Importance of Geology

Importace of Geology

Importance of Geology The value of geology in Mining has long been known but its use in Civil Engineering has been recognized only in comparatively recent years. The importance of geology in civil engineering may briefly be outlines as follows:- Geology provides a systematic knowledge of construction material, its occurrence,composition, durability and other properties. Example of such construction materials is building stones, road metal, clay, limestones and laterite. The knowledge of ... Read More »

Structure of the Earth

Structure of the Earth The study of the passage of seismic waves through the earth has helped in knowing the structure of the earth’s interior and in defining the physical properties of various layers. The seismic waves travel at different velocities depending on the nature of the layer in which they are traveling. Thus they not only indicate the position of each layer but also give clues as ... Read More »

Volcanic Activity

Volcano Activity

Volcanic Activity According to the plate tectonic theory, there are three principal zones of volcanic activity. Spreading Center Greatest volcanic extrusions at mid oceanic ridges where sea floor spreading is active. As the lithosphere moves apart, basaltic magma rise form the asthenosphere and fills the gap. Many successive eruptions, sometimes produces volcanic cone which may rise above sea level. Subduction Zones In ... Read More »

Types of Rocks

Types of Rocks

Types of Rocks Sedimentry (Types of Rocks) Sedimentary rocks are formed by consolidation and cementation of the sediments deposited under water. Typical sedimentary rocks are sandstones, limestone and shale. The formation of sedimentary rocks place in three stages Weathering and Erosion During weathering and erosion, the preexisting rocks and their constituent minerals are broken down. The material thus produced is called the sediment. The sediments are ... Read More »

Properties of Rocks and Minerals

Properties of Rocks

Properties of Rocks and Minerals In order to select the rock material for the construction the properties are commonly examined Mineral Composition The rocks are aggregates of minerals. If the mineral continents of a rock are hard, free from cleavage and resistant to weathering, it is likely to be strong and durable. The rocks which are rich in weak minerals, such as micas, chlorite, talc, ... Read More »

Plate Tectonics

Plate Tecthtonic

Plate Tectonics The theory of plate tectonics has enveloped from Harry’s concept of sea flooring spreading. He proposed this concept in the early 1960’s. The Hess’s hypothesis was accepted when the Vine and Mathews used it in explaining linear magnetic anomalies of the ocean basins. In 1967, WJ Morgan and J.T Wilson extended the idea of Hess and produced the ... Read More »

Landslide

Land Sliding

Landslide “When a mass of earth or rock slides down the slope along a definite zone of surface, the movement is called a landslide“. This movement takes place under gravity and is facilitated by moisture which acts a lubricating agent. The landslides start with slow movement along a slip surface followed by a rapid movement of the separated portion of the earth mass. Causes of LandSliding ... Read More »

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