Category «Short Notes»

Denudation

Weathering is the process of disintegration of rock particles from the surface of rocks is known as weathering, while erosion is the process by which the weathered particles are separated and transported from the parent rock to the low-lying areas. The combined process of weathering and erosion is known as Denudation. The weathering mass movement …

What is mid-oceanic ridge (MOR)?

A mid-ocean ridge (MOR) is a seafloor mountain system formed by plate tectonics. It typically has a depth of ~ 2,600 meters (8,500 ft) and rises about two kilometers above the deepest portion of an ocean basin. This feature is where seafloor spreading takes place along a divergent plate boundary. In the middle of the ocean, there …

Earthquake Zones

Major Earthquake zones of the world include countries located on the Asian coast of the Pacific, the eastern coast of the Pacific covering the west coast of North America, and Latin America. Detail of the major zones is as under: The heaviest concentration of earthquakes is along the circum-pacific belt. It includes countries of Japan, …

Volcanic Production/ Lava Composition

Volcanic eruptions produce many products out of which the following are very important; (1). Tuff: Rocks comprising of fine ash. (2). Agglomerates: Rocks consisting of pieces larger than 20 mm. (3). Volcanic Bombs: Rock pieces with a diameter of more than 32 mm. (4). Cinders: Fragments with diameter between 4 mm -32 mm. These are …

What is denudation

The process of breakage and separation of sediments and particles of the rocks from the rock surface is known as weathering, while the process of wearing away/ transportation of these sediments from the rock surface to the low lying areas is known as erosion. The process of weathering and erosion collectively are known as Denudation. …

Active, dormant and Extinct Volcanoes

Active Volcanoes: An active volcano may be defined as the one which is definitely known to have erupted periodically in historic times. Kilauea volcano on Hawaii is the world’s most active volcano, followed by Etna in Italy and Piton de la Fournaise on La Réunion island. Further ordering the value of the activity of volcanoes …

What is crater (Volcanic crater)

A crater is the mouth/ opening of the volcano. The molten magma is ejected through the vent of the volcano. The uppermost part of the vent or in other words the top opening of the vent is known as the crater. The crater is generally wider than the vent. When the lava/ejected material is sprayed …

What is a Lava?

The molten rocks (magma) are ejected as a result of volcanism. When the magma is extruded through the vent of the volcano, it is scattered all around the crater (mouth of the volcano). The magma after extrusion is known as ”Lava”.   Composition of Lava:  Lava is made up of crystals, volcanic glass, and bubbles …

What is a magma

The molten rocks present in the interior of the earth’s mantle is known as magma. The interior temperature of the earth is very high, which melts the rocks present in the mantle. The molten rocks when extrude through the vent of the volcano are known as lava. In other words lava before ejection is known …

What is a vent of volcano

It is also known as a fissure vent, eruption vent, or simply volcanic vent. A vent is a vertical pipe-like hole through which the volcanic materials/ lava (magma, rocks, debris, volcanic ash, water, and other fluids, and minerals) are extruded.