Super continents

In geology, a supercontinent is the assembly of most or all of Earth's continental blocks or cratons to form a single large landmass. However, some earth scientists use a different definition, "a grouping of formerly dispersed continents", which leaves room for interpretation and is easier to apply to Precambrian times although at least about 75% of the continental crust then in existence has been proposed as a limit to separate supercontinents from other groupings.

Supercontinents have assembled and dispersed multiple times in the geologic past (see table). According to modern definitions, a supercontinent does not exist today. The supercontinent Pangaea is the collective name describing all of the continental landmasses when they were most recently near to one another. The positions of continents have been accurately determined back to the early Jurassic, shortly before the breakup of Pangaea (see animated image). The earlier continent Gondwana is not considered a supercontinent under the first definition since the landmasses of Baltica, Laurentia and Siberia were separate at the time.Supercontinents appear to form by two end-member processes: extroversion, in which the oceanic lithosphere surrounding the supercontinent (exterior ocean) is preferentially subducted (e.g. Pannotia), and introversion in which the oceanic lithosphere formed between dispersing fragments of the previous supercontinent (interior ocean) is preferentially subducted (e.g. Pangea). Extroversion can be explained by “top–down” geodynamics, in which a supercontinent breaks up over a geoid high and amalgamates above a geoid low. Introversion, on the other hand, requires that the combined forces of slab-pull and ridge push (which operate in concert after supercontinent break-up) must be overcome in order to enable the previously dispersing continents to turn inward. As Eurasia moves laterally along the Ring of Fire, it will eventually collide with the Americas, forming a new supercontinent in the next 50 million to 200 million years.

Image via- en.wikipedia.org

NDKBlogs

Comments

Jeff bezos | The first trillioniar?

According to trusted sources, Jeff Bezos American entrepreneur Description Description Jeffrey Preston Bezos is an American entrepreneur, media proprietor, investor, and computer engineer. He is the founder and executive chairman of Amazon, where he previously served as the president and CEO. Jeff bezos is the worlds leading and top billionaire with a net worth of 203 million dollars. The challenging billionaires to Jeff is Bill gates, Elon Musk & Mark Zukerburg. Currently the Forbes analysts says that Jeff bezos is going to reach as the worlds first person with a net worth of 1 trillion dollars by 2024. But currently stock rates are changing rapidly. The only person who can pass Jeff is Elon musk, the Controlling share holder of Space X and Tesla inc. Facts from Forbes.com, Jeff Bezos founded e-commerce giant Amazon in 1994 out of his garage in Seattle. He stepped down as CEO to become executive chairman on July 5, 2021. In April 2020, Bezos said he would give $100 million to

why is the parcel islands in google earths satellite view is blocked? |NDK research.

NDK research™ The reason why the parcel island satellite view is blocked in google earth. How parcel islands are showen in google ™ Earth. ©Google map data Parcel islands According to the information available to the general public parcel islands is claimed from the vitamin’s government but china, Twain also claim. South Vietnam's claim to the islands was inherited by the Socialist Republic of Vietnam which has ruled all of Vietnam since 1975. The ownership of the islands remains hotly contested. China , Vietnam, and Taiwan all claim de jure sovereignty, although the PRC has de facto control of the islands. Geographical location. Vietnam is located west (Left) to parcel islands. Hongkong, twain is located to the north (up). Philippians is located to the east (right). Geographical location of the islands. ©Google map data From the sources. Can you visit the Paracel Islands? South China Sea: Tours around Paracel Islands where foreigners are banned. Islands in th

Cyber crime & security |#NDKtechnology

#NDKtechnology According to wikipedia.org Cyber crime is defined as Cybercrime is a crime that involves a computer and a network. The computer may have been used in the commission of a crime, or it may be the target. Cybercrime may harm someone's security and financial health. Virus & malware What are the different types of Malware? Worms. Worms are spread via software vulnerabilities or phishing attacks. ... Viruses. Unlike worms, viruses need an already-infected active operating system or program to work. Bots & Botnets. Trojan Horses. Ransomware. Adware & Scams. Spyware. Spam & Phishing. Cyber security According to wikipedia.org, Cyber security is the application of technologies, processes and controls to protect systems, networks, programs, devices and data from cyber attacks . It aims to reduce the risk of cyber attacks and protect against the unauthorised exploitation of systems, networks and technologies. Top 10 most notorious cyber attacks in his

NDK blog™

Search This Blog