Skip to main content

Tectonic Plates

Tectonic plates are pieces of earth's crust and uppermost mantle,together referred to as the lithosphere.The plates are around 100 km (62 mi)thick and consist of two principal material:ocean -crust(also called sima from silicon magnesium) and continental crust (sial from silicon and aluminium).The composition of the two types of crust differs markedly,with basaltic rocks ("mafic")
dominating oceanic crust,while continental crust consists principally of lower density granitic rocks.

Geologists generally agree that the following tectonic plates exist on the earth's surface with roughly definable boundaries.Tectonic plates are sometimes subdivided into three fairly arbitrary categories:
major (or primary) plates,minor (or secondary) plates, and micro (or tertiary) plates.

Major plates :
These plates comprise the bulk of  the continents and the pacific ocean.A major plate is any plate with an area greater than 20 million km.

Minor plates :
These smaller plates are often not shown on major plate maps,as the majority do not comprise significant land area.A minor plate is may is any plate with an area less than 20 million km but grater than 1 million km.

Micro plates :  
These plates are often grouped with an adjacent major plate on a major plate map.A micro plate is less than the area of 1 million km.


Types of Tectonic Plates
  

The center of the earth contain's high temperature is 6000 degree celsius it is 1000 times grater than in a previous experiments run from 20 years. Heat came  from the inner core to earth surface at this time the tectonic plates are move's .when the plates are moved they collide with each other then Earthquake's,Tsunami's are formed and also volcanoes are blasted.    


Heat comes from inner core of the earth
  

Comments

Post a Comment

Popular posts from this blog

Dark matter

Dark matter  is an unidentified type of matter  distinct from dark energy ,  baryonic matter  (ordinary matter),  and neutrinos . It comprises approximately 27% of the  mass and energy  in the   observable universe .  The name refers to the fact that it does not emit or interact with electromagnetic radiation , such as light, and is thus invisible to the entire electromagnetic spectrum .  Although dark matter has not been directly observed, its existence and properties are inferred from its gravitational effects such as the motions of visible matter, gravitational lensing , its influence on the universe's large-scale structure , and its effects in the cosmic microwave background . Dark matter is transparent to    electromagnetic radiation  and/or is so dense and small that it fails to absorb or emit enough radiation to be detectable with current imaging technology.                                  Estimates of masses for galaxies and larger structures via dynamical and 
Post a Comment
Read more

Cretaceous period

The Cretaceous is geologic period and system that spans 79 million years from the end of the Jurassic period 145 million years ago to the beginning of the Paleogene Period 66 mys. It is the last period of the Mesozoic Era and the longest period of the Phanerozoic Eon. The Cretaceous Period is usually abbreviated K, for its German translation Kreide (chalk, creta in Latin) . The Cretaceous was a period with a relatively warm climate, resulting in high eustatic sea levels that created numerous shallow inland seas. These oceans and seas were populated with now-extinct marine reptiles, ammonites and rudists, while dinosaurs continued to dominate on land. During this time, new groups of mammals and birds, as well as flowering plants, appeared . Research History :- The Cretaceous as a separate period was first defined by Belgian geologist Jean d'Omalius d'Halloy in 1822, using strata in the Paris Basin and named for the extensive beds of chalk (calcium carbonate depo
1 comment
Read more

Red rain

The Kerala red rain phenomenon was a blood rain event that occurred from 25 July to 23 September 2001, when heavy downpours of red-colored rain fell sporadically on the southern Indian state of Kerala, staining clothes pink. Yellow, green, and black rain was also reported. Coloured rain was also reported in Kerala in 1896 and several times since, most recently in June 2012, and from 15 November 2012 to 27 December 2012 in eastern and north-central provinces of Sri Lanka.                   Following a light microscopy examination in 2001, it was initially thought that the rains were colored by fallout from a hypothetical meteor burst, but a study commissioned by the Government of India concluded that the rains had been colored by airborne spores from a locally prolific terrestrial green alga from the genus Trentepohlia. an international team later identified the exact species as T.annulata.     Occurrence :-    The colored rain of Kerala began falling on 25 July 2001,
Post a Comment
Read more