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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 …

Metamorphic rocks and their types

METAMORPHIC ROCKS: Metamorphic rocks are originated from already existed Igneous, and Sedimentary Rocks. The term metamorphic is derived from a Greek word meaning change. Thus the metamorphic rocks are those that have been changed by heat and pressure. Thus actually these are those igneous or sedimentary rocks, which have changed through metamorphism. Metamorphism is the …

Sedimentary Rocks and their types

SEDIMENTARY ROCKS: Sedimentary rocks are the rock, which come into form due to the deposition of sediments and gravels. The layer of the deposited material is compacted due to the intense pressure exerted by the upper layer of sediments. Each of the above layer put pressure on the lower layer, thus compacting and strengthening the …

What are Igneous rocks? different types of Igneous Rocks.

There are three basic types of rocks. The igneous rocks, the metamorphic, and the sedimentary rocks. This classification has been made by earth scientists on the basis of their formation, properties, and composition. Read this classification in detail. Types of rocks. Igneous Rocks: The term igneous has been derived from the Latin word “Ignis”, which …

Types and classification of Rocks

On the  basis of their origin, characteristics, and information, the rocks are classified into following three types: Igneous Rocks Sedimentary (Aqeous) Rocks Metamorphic Rocks (A). IGNEOUS ROCKS: The term igneous is based on the Latin word ignis meaning fire. Thus it denotes those rocks which originated through fire. Technically speaking, these rocks were formed as …

What are rocks and rock formation

What are the Rocks: The crust of the Earth comprises several types of rocks which range from concrete-like hardness to soap-like softness. A rock may be defined as an assemblage of a mineral such as quartz or several minerals. According to Tark and Martian, “A rock is an aggregate of minerals, sometimes chiefly or entirely …

Spheres of the Earth

There are four main spheres of the earth. Atmosphere Hydrosphere Lithosphere Biosphere (1). Atmosphere: The uppermost gaseous layer of the earth is called the Earth’s Atmosphere. The earth’s atmosphere stretches from the earth surface to thousands of kilometer up. The thickness of the atmosphere is about 10,000 km. After the height of 10,000 km, the …