--- title: The internet and undersea cables — a lesson of Mova's school · trees and pragmatics description: «The internet and undersea cables», a lesson of the technology course of Mova's primary school, sentence by sentence with dependency trees and pragmatics. It begins: The internet is not one machine; it is a network of networks, millions of computers joined together. --- [Mova](https://md.mova.elamur.ai/free/en/) · [this page in HTML](https://mova.elamur.ai/free/en/corpora/school/technology/37-the-internet-and-undersea-cables/) [home](https://md.mova.elamur.ai/free/en/) / [corpora](https://md.mova.elamur.ai/free/en/corpora/) / [school](https://md.mova.elamur.ai/free/en/corpora/school/) / [Technology](https://md.mova.elamur.ai/free/en/corpora/school/technology/) / The internet and undersea cables # The internet and undersea cables Lesson 37 of the technology course of Mova's primary school: 17 sentences, each with its syntax tree and pragmatics. The lessons are written for Mova, and their agreed trees are part of Mova corpus 0.4 (CC BY-SA 4.0). How Mova does on its tests: [the lesson at school](https://md.mova.elamur.ai/free/en/school-run/technology/37-the-internet-and-undersea-cables/). - [0](https://md.mova.elamur.ai/free/en/corpora/school/technology/37-the-internet-and-undersea-cables/0/) — The internet is not one machine; it is a network of networks, millions of computers joined together. - [1](https://md.mova.elamur.ai/free/en/corpora/school/technology/37-the-internet-and-undersea-cables/1/) — When you open a web page, it is chopped into small packets, like a big jigsaw posted in many envelopes, and each packet hops through machines called routers, maybe along different roads, until they are put back together on your screen. - [2](https://md.mova.elamur.ai/free/en/corpora/school/technology/37-the-internet-and-undersea-cables/2/) — To cross oceans, most of the internet does not fly through space. - [3](https://md.mova.elamur.ai/free/en/corpora/school/technology/37-the-internet-and-undersea-cables/3/) — It goes through cables lying on the sea floor, with glass threads as thin as a hair inside, carrying flashes of light from one continent to another. - [5](https://md.mova.elamur.ai/free/en/corpora/school/technology/37-the-internet-and-undersea-cables/5/) — The internet also has tricksters. - [6](https://md.mova.elamur.ai/free/en/corpora/school/technology/37-the-internet-and-undersea-cables/6/) — A message that pretends to be your bank, a game or a friend and asks for a password or money is a scam: never give passwords, never click strange links, and always tell an adult. - [7](https://md.mova.elamur.ai/free/en/corpora/school/technology/37-the-internet-and-undersea-cables/7/) — The internet is a network of networks: data is sent in small packets that hop through routers along many paths and are put back together at the end, and if a packet gets lost it is simply sent again; a single web page can come in hundreds of packets. - [8](https://md.mova.elamur.ai/free/en/corpora/school/technology/37-the-internet-and-undersea-cables/8/) — Don't share personal information online, and tell an adult if something online upsets you. - [9](https://md.mova.elamur.ai/free/en/corpora/school/technology/37-the-internet-and-undersea-cables/9/) — Most data between continents travels through undersea cables, not satellites; inside, thin glass fibres carry pulses of light; there are many such cables, so if a ship's anchor cuts one, data goes round by the others, maybe more slowly, until it is mended. - [10](https://md.mova.elamur.ai/free/en/corpora/school/technology/37-the-internet-and-undersea-cables/10/) — In a fibre-optic cable, light bounces along a hair-thin glass thread, carrying data as flashes, and it can travel a long way before it needs boosting; never look into the end of a fibre. - [11](https://md.mova.elamur.ai/free/en/corpora/school/technology/37-the-internet-and-undersea-cables/11/) — A website is a set of files stored on a server and sent to your browser, which shows them as a page; the World Wide Web was invented by Tim Berners-Lee in 1989. - [12](https://md.mova.elamur.ai/free/en/corpora/school/technology/37-the-internet-and-undersea-cables/12/) — A search engine uses programs that crawl the web and build a huge index, then ranks pages for your words; results are not always true, so check sources. - [13](https://md.mova.elamur.ai/free/en/corpora/school/technology/37-the-internet-and-undersea-cables/13/) — A data centre is a building full of computers called servers, with cooling and backup power, and some are built in cold places to save on cooling. - [14](https://md.mova.elamur.ai/free/en/corpora/school/technology/37-the-internet-and-undersea-cables/14/) — When you stream a film it is sent in small pieces as you watch, with a little stored ahead, and the quality changes with the speed of your connection; when the stored part runs out, it buffers. - [15](https://md.mova.elamur.ai/free/en/corpora/school/technology/37-the-internet-and-undersea-cables/15/) — An email is sent to your email provider's server and passed to the other person's server; the @ sign was chosen for email in 1971. - [16](https://md.mova.elamur.ai/free/en/corpora/school/technology/37-the-internet-and-undersea-cables/16/) — Online scams are fake messages that pretend to be someone you trust to get passwords or money; banks will never ask for your password by message. - [18](https://md.mova.elamur.ai/free/en/corpora/school/technology/37-the-internet-and-undersea-cables/18/) — A smart speaker listens for a wake word, and only then sends your request to computers online for an answer; ask an adult before using one, because it may store recordings. - ← previous: [Computers and screens](https://md.mova.elamur.ai/free/en/corpora/school/technology/36-computers-and-screens/) - next →: [Satellites and GPS](https://md.mova.elamur.ai/free/en/corpora/school/technology/38-satellites-and-gps/) - ↑ back to [Technology](https://md.mova.elamur.ai/free/en/corpora/school/technology/)