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Category: Theory of Plate Tectonics and Continental Drift

Introduction to Plate Tectonics

 What are Plate Tectonics: Summary: The planet on which we live is called Earth. The globe of earth consists of three layers. The outermost layer is called Earth’s Crust, the layer lying beneath the Earth’s Crust is called Magma. While the inner most layer of the earth is Core. Outer Crust is hard and

Tectonic Plate Boundaries

Three types of plate boundaries are recognized and are depicted in following figure. A spreading boundary occurs where plates are moving away (diverging) from one another , like along the mid-ocean ridge. Here, new crust is formed. Convergent boundaries are located where subduction is active and the lithosphere is being ”consumed”. This occurs where two

Causes of movement of Tectonic Plates

There are a number of competing theories that attempt to explain what drives the movement of tectonic plates. Three of the forces that have been proposed as the main drivers of tectonic plate movement are: Thermal/Mantle Convection Scientists believe that one of the primary forces behind plate movement is thermal convection. Thermal convection is when heat

Plate Tectonics and Continental Drift

Plate Tectonics and Concept of Continental Drift: The surface of the Lithosphere is fractured into a number of tectonic plates (also known as Lithospheric or crystal plates) which are in constant motion. As these plates move and collide, the lithosphere buckles, warps, and is turned apart. When this occurs, the Earth’s surface shakes with great

Evidence of Continental Drift

If the continents were in one piece at some time int the past, we should find similar fossils and rocks on both continents which is precisely what Wegener discovered. By studying the geologic record, the fossil record and climatic record, he found remarkable similarities between Africa and South America. Fossils of same species of plants

Plate Tectonics and their significance.

Plate Tectonics refers to the process of plate formation, movement and destruction. It finds its foundations in two theories, continental drift and sea-floor spreading. Continental drift describes the movement of continents over the Earth’s surface. Sea floor spreading refers to the creation of new oceanic plate material and movement away from the mid-ocean ridge. It

Modern theory of Plate Movement and Continental Drift

The  movement of lithospheric plates, referred to as continental drift is believed to be caused by the radioactive decay of elements in the core and mantel that produces heat. The heat, in turn, creates convection currents in the mantle which ”drive” the plates along their path of movement. When plates collide, heavier, denser plates dive

Explanation of Sea Floor Spreading

Sea Floor Spreading: Sea Floor Spreading is the result of divergent plate motion inside the ocean. Here two oceanic plates diverge from each other and a gap between the two plates is produced. This gap is filled by the magma which erupts from the mantle. Seafloor spreading is a process that occurs at mid-ocean ridges, where new oceanic crust is