Category «Uncategorized»

Weathering and its types

Weathering: Weathering is defined as the physical disintegration and chemical alteration of Earth materials by the action of water, air, and organisms. For example, the breakdown of rocks in situ, their disintegration and decomposition without distant transportation of the products. The process of creation of new relief features and wear and tear of Earth materials …

Changes brought about by the earthquakes?

The earthquakes cause major changes in the crust and on the surface of the Earth. Important changes are as given below: (1). Expansion of Earth’s Crust (2). Contraction of Earth (3). Disturbance of drainage system (4). Mud Volcanoes (5). Cultural Landscape (6). Landsliding (7). Fire (8). Liquefaction, Subsidence, and Related Effects (9). Tsunamis (1). Expansion …

Causes of Earthquakes

An earthquake is a natural phenomenon, which has many causes behind it. Some of these are natural while others are man-made. Among these causes, the most important are as follow; (1). Tectonic Movement causes Earthquakes: Earth’s crust is divided into large segments (fragments) separated along ridges. These segments are called plates (Lithospheric Plates). The term …

Magnitude of Earthquakes

The intensity of an earthquake is assessed on the Rickter Scale, which was developed by geophysicist Charles Richter in 1935. This scale assigns a number to an earthquake based on the severity of the ground motion It ranges from 0 to 8+. It is logarithmic so that an earthquake with a magnitude 4 causes 10 …

What is an Earthquake?

An Earthquake may be defined as the shaking and trembling of the Earth’s surface caused by sudden releases of stress with the crust of Earth. Thus an earthquake releases the energy that has been gradually stored through the stress of increasing deformation of rocks. The released energy takes the form of seismic waves that radiate …

Volcanic Form

Volcanic Form The erupted volcano comes in different forms. These forms are given as under: (1). Ash Cone: These are also called Tuff Cones. When heated rapidly by lava, water flashes to steam and expands violently, fragmenting huge amounts of lava into plumes of very fine grains of ash. This ash falls around the volcanic vent, creating an ash …

Global distribution of Volcanoes

According to improved knowledge of ocean floor, topography, and geology the entire Pacific Ocean floor constitutes a very large tectonic plate with smaller Cocos and Juan de Fuca Plates. Most of the global volcanic activity is concentrated at convergent plate boundaries. The majority of the world’s active volcanoes lie along the Pacific Ring of Fire. …

What is Metamorphism? Different types of metamorphism.

Process of Metamorphism: Metamorphism may be defined as the process of transformation of igneous or sedimentary rocks to metamorphic rocks ( changed rocks ) through the Earth’s movements ( producing heat and pressure). The metamorphism can be thermal when the intrusion of hot mass of igneous rock raises temperature of surrounding rocks. Similarly these can …

Process of Volcanism

Volcanism can be defined as the eruption and extrusion of internal molten rocks of Mantle onto the surface of the earth. The volcano erupts through a crater of the volcano. The eruption of lava and gases takes place as a result of the fast movement of lava/ magma. Scientists use the term magma for the …