Plate Boundaries and their types !!!

The Continental drift theory by Alfred Wegner tells that the continents are on the move but fails to explain the actual cause of this movement. Thanks to the Plate Tectonics theory and the Sea Floor Spreading theory we now know what actually causes this movement !!

From the deepest ocean trench to the tallest mountain, plate tectonics explains the features and movement of Earth's surface in the present and the past.

The Earth's crust is not uniform and is broken into many smaller pieces called "Lithospheric Plates".The term 'Lithosphere' includes the earth's crust and the upper mantle. These plates can either be the "Oceanic" plate or the "Continental" plate. These plates float on the inner mantle due to the convection currents occuring inside the mantle. Convection currents describe the rising, spread, and sinking of gas, liquid, or molten material caused by the application of heat.
eg. -> Inside a beaker, hot water rises at the point where heat is applied. The hot water moves to the surface, then spreads out and cools. Cooler water sinks to the bottom.

Similarly, the convection inside the mantle drives plates tectonics through a combination of pushing and spreading apart at mid-ocean ridges and pulling and sinking downward at subduction zones and trenches.

Coming to their types, there are 3 types of plate boundaries :1) Convergent boundaries 2) Divergent boundaries 3) Transform boundaries.

Comments

Anabatic and Katabatic winds

Anabatic = moving upwards ; Katabatic = moving downwards . Anabatic winds which flow upslope of a mountain from lower valleys develop during daytime in calm sunny weather. They are warm winds which blows up a steep slope or mountain side, driven by heating of the slope through insolation . Air which is in contact with slopes that are warmed expands upward and cool and sinks over neighbouring valleys. Anabatic winds are usually slow , at only 1-2m/s and are rarely important expect near coasts where they can increase the strength of sea breezes. Anabatic winds are particularly useful to soaring glider pilots who can use them to increase the aircraft's altitude. Anabatic winds can be detrimental to the maximum downhill speed of cyclists. Katabatic winds are downslope winds flowing from high elevations of mountains, plateaus, and hills down their slopes to the valleys or plains below. During and after sunset ,

Bay,Gulf,Strait,Isthmus,Peninsula Explained !!

∎ Bay ➤ A bay is a body of water that is partly surrounded by land. Bays empty out into larger bodies of water like oceans and lakes. They are sometimes confused with other bodies of water such as gulfs, but bays are typically smaller . There are various ways in which bays can form. The largest bays have developed through plate tectonics. As the super-continent Pangaea broke up along curved and indented fault lines, the continents moved apart and left large bays; these include the Gulf of Guinea, the Gulf of Mexico, and the Bay of Bengal, which is the world's largest bay. Bays also form through coastal erosion by rivers and glaciers. A bay formed by a glacier is a fjord. Rias are created by rivers and are characterized by more gradual slopes. Bays can also be found along the shores of lakes. Bays are usually much calmer and more protected than seas or oceans . The land surrounding a bay often reduces the strength of winds and blocks waves. Most bays make excellent harbors and m

Without Geography you are nowhere !!!

Search This Blog