Complete list of Ship Types Commonly, though, the standard lateen rig for xebecs had a single triangular sail on each mast, and had none of a square rig's topsails or topgallants. The lateen rig offered many advantages over the square rig, the most significant of which was the ability to pinch far closer to the wind than square sails could. This meant they could both quickly catch up to and quickly flee from square-rigged vessels when sailing close to the wind. The corsairs favored the xebec for its speed and maneuverability, and for its shallow draft which also aided in escaping larger vessels. These qualities were recognized by many of the European navies, and the vessel was quickly adopted into the Mediterranean squadrons as commerce-raiders and anti-piracy cruisers. The xebec under sail was a beautiful sight, and it is said that the design was one of the fastest and most agile in the Mediterranean. Xebecs were also lightly-built vessels. Historically, the xebec was not well-represented in the Caribbean.
Desert Animals iRBAN iRBAN | iRBAN iRBAN Vidéos Gag irban irban: videos d'humour irban irban soutenir le Football Algérien Sid the Science Kid . I Sense Come play again later! Come play again tomorrow! Ornithos Atlantic Rainforest Webcam World Land Trust uses cookies to make all features of the website work effectively, and they are essential if you wish to donate online. Some cookies on this site are essential, and the site won't work as expected without them. These cookies are set when you submit a form, login or interact with the site by doing something that goes beyond clicking on simple links. We also use some non-essential cookies to anonymously track visitors or enhance your experience of the site. If you're not happy with this, we won't set these cookies but some nice features of the site may be unavailable. By using our site you accept the terms of our Privacy Policy. (One cookie will be set to store your preference) (Ticking this sets a cookie to hide this popup if you then hit close. About this tool About Cookie Control
Classificazione delle navi Ogni nazione ha il suo registro. In Italia abbiamo il Registro Navale Italiano che dà l'abilitazione alla navigazione secondo le seguenti categorie: navi di lungo corso (L): abilitate a navigare in tutti i mari. navi per la navigazione nell'Atlantico (AT)navi di grande cabotaggio (G): possono navigare oltre gli stretti di Gibilterra, dei Dardanelli e il Canale di Suez, a distanza non superiore alle 300 miglia dalla costa. navi di piccolo cabotaggio (P): è consentita la navigazione solo nel Mediterraneo. navi per la navigazione costiera (C)navi per la navigazione interna (I): navigano sui fiumi e sui laghi. Le navi vengono suddivise nelle varie categorie in relazione al mezzo di propulsione, al tipo di propulsore, alla struttura dello scafo, all'impiego a cui sono destinate. Secondo il mezzo di propulsione si hanno: navi a vela o velieri, motovelieri, navi con motore ausiliario, navi a propulsione meccanica. La velatura è portata da alberi verticali (uno, due, tre ed oltre). Eliche Ruote a pale
Australian Desert Animals - Wildlife In The Outback Australian desert animals had to evolve some nifty adaptations to the harsh Outback environment they live in. The Australian Outback deserts are not the driest deserts in the world, it actually rains a fair bit here and there is a lot of wildlife... But the rain is unpredictable. Years may pass between showers. Often, when it rains it pours and the desert turns into a big flood plain. Below are pictures and links to more information about Australian desert animals. Australian Desert Animals 1 The Bilby The pretty and delicate bilby once lived across most of the Australian inland deserts. Like most desert animals the bilby hides during the day and forages at night to avoid heat and dehydration. They are so efficient in conserving water that they don't need to drink. Australian Desert Animals 2 The Perentie The Perentie, a two meter monitor lizard that lives in the Australian deserts, uses the same strategy: it shelters in underground burrows. Australian Desert Animals 3 The Thorny Devil
الأنين - الموسوعة العملاقة لطلبة الجامعات Science Y1 Senses - Y1 Senses, Science Sessions, Key Stage 1, Hamilton Trust Help Primary Science Resources Welcome to the Science planning area of our site! Here you will find a selection of Science Strands for each of the age ranges Key Stage 1 (Years 1 and 2), Lower Key Stage 2 (Years 3 and 4) and Upper Key Stage 2 (Years 5 and 6). They include teaching sessions and resources. Click on View KS1, LKS2 or UKS2 to see which Science Strands are available for your chosen age range and a short description of each Strand. Many of the sessions in the Science Strands are suitable to teach alongside particular cross-curricular Topics. All the Science Strands are available for registered users of Hamilton to use. For further support click on the Help button at the foot of the page.
Earth Floor: Biomes There are many different kinds of plants and animals on the Earth, but only certain kinds are naturally found at any particular place. (We are not counting zoos here!) For example, cacti are found in the desert, polar bears are found in the Arctic, and elephants are found in central Africa and India. So, why don't people living in south Texas have to be on the lookout for snow leopards, or why don't kids in Minnesota have to worry about finding giant boa constrictors in their back yards? These average weather conditions, such as the range of temperature and rainfall that typically occur in a particular location like Minnesota, are called the climate of that location. Plants and animals don't live in isolation, but they live together with other plants and animals in an interdependent group called an ecological community. A distinct ecological community of plants and animals living together in a particular climate is called a "biome." Next
Breve storia delle imbarcazioni, tipi di velieri e cenni sulle navi. pagina indice Breve storia delle imbarcazioni, tipi di velieri e cenni sulle navi. E' la fisica, con il Principio di Archimede, che ci fa capire come fanno a galleggiare le navi, ed in generale tutte le imbarcazioni. Infatti questo teorema afferma che: "Un corpo immerso, totalmente o parzialmente, in un fluido riceve una spinta verticale, dal basso verso l'alto, pari al peso di una massa di fluido di forma e volume uguale a quella della parte immersa del corpo." La nave nell'antichità. La nave e la sua storia sono strettamente collegate alla necessità di avere un mezzo di trasporto da usare sull'acqua. I Fenici furono i più abili costruttori di navi dell'Antico Occidente. La nave nel Medioevo. La Marina Bizantina poteva contare su vari tipi di imbarcazioni: Dromoni, Chelandie, Corsieri, Acazie. Più grande della Galea fu la Galeazza. La nave nell'età moderna. Maggiori informazioni specifiche sui velieri, e sulla loro storia, le trovi nella pagina "velieri". 4. 7. 1. 5. 8. 11. 13. 1. 2. 3. 4.
Bill Moyers Reports: Earth on Edge - Ecosystems Ecosystems are communities of interacting organisms and the physical environment in which they live. They are the combination and interaction of the plants, animals, minerals, and people in any given area of the Earth. A small bog, a single sand dune, or a tiny patch of forest is an ecosystem. In our heavily industrialized societies, work, religious expression, and recreation often take place in urban areas. It is our very reliance on ecosystems that is threatening them. For comprehensive data about the world's ecosystems, visit EarthTrends at www.earthtrends.wri.org/. Take our Interactive Quiz to see how much you know about ecosystems, then check out our Get Involved section to learn about ways you can make a positive difference in your home, your community, and your world.
classificazione Si definiscono navi tutti quei galleggianti di notevoli dimensioni capaci di muoversi autonomamente da un punto all’altro della superficie terrstre. Le navi possono essere classificate in quattro grossi gruppi: -Secondo il loro mezzo propulsivo; -Secondo l’uso cui sono destinate; -Secondo il tipo di scafo e le sue sovrastruttre; -Secondo il sistema d’ossatura usato per la loro costruzione. In questo paragrafo verranno classificate le navi secondo gli usi cui sono destinate. -Navi da Guerra; -Navi da Pesca; -Navi da Diporto; -Navi Mercantili. Sarà descritto ogni tipo di nave menzionato, con particolare riferimento alle navi mercantili. - Navi da guerra Sono navi progettate per svolgere le diverse attività connesse con una guerra combattuta sul mare. - Navi da pesca A questo tipo appartengono tutte quelle navi che sono impiegate nella pesca commerciale. I pescherecci utilizzati in Europa presentavano una vasta gamma di modelli e attrezzature. - Navi da diporto ·Navi: le unità che hanno lft>24 nm 1.
Biomes of the World - Biome Map Click on a biome on the above graph for more information, informative videos, and links to scientist profiles, travel information, lesson plans and species profiles for each region. We'd like to know where you're coming from. If you've used this site for a class project or browsing for fun, add yourself to our map and communicate with other "ecogeeks"