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Fossil fuel

Fossil fuels are fuels that come from old life forms that decomposed over a long period of time. The three most important fossil fuels are coal, petroleum, and natural gas. Oil and gas are hydrocarbons molecules that have only hydrogen and carbon ...

                                               

Coal

Coal is a hard rock which can be burned as a solid fossil fuel. It is mostly carbon but also contains hydrogen, sulphur, oxygen and nitrogen. It is a sedimentary rock formed from peat, by the pressure of rocks laid down later on top. Peat, and th ...

                                               

Gasoline

Gasoline, or petrol, is a toxic, clear liquid that is mostly used as a fuel in internal combustion engines. It is made by boiling petroleum, a fossil fuel. In a distillation process, petroleum is heated to a very high temperature, then it separat ...

                                               

Heating oil

Heating oil is oil that is burned as fuel in furnaces inside of buildings. The oil is usually delivered by tanker truck to individual homes and business places, and the oil is stored in oil tanks in the basement or outside, next to the building. ...

                                               

Petroleum

Petroleum, also called crude oil, is a thick and black liquid. It is a natural material mainly made of hydrocarbons. Most petroleum is found by drilling down through rocks on land or off-shore on the continental shelf. Major producers are in the ...

                                               

Wood

Wood is the main substance in trees. It is mainly formed by the xylem vessels which carry water up the plant. The two main substances in wood are cellulose and lignin. Wood is used to make buildings and furniture, and also for art. Firewood is a ...

                                               

Cork (material)

Cork is a material that is harvested for commercial use primarily from the bark of the Cork Oak tree. As the cork is harvested. Portugal produces 50% of cork worldwide. Cork is made up of suberin, a hydrophobic substance. In general, cork is made ...

                                               

Driftwood

Driftwood is wood that has been washed onto the shore of a sea, river, or lake by winds, tides, waves or man. In some waterfront areas, driftwood is a major nuisance. However, the driftwood provides shelter and food for birds, fish and other aqua ...

                                               

Hardwood

Hardwood is wood from deciduous trees and broad-leaf evergreen trees. All hardwoods are angiosperms, the largest group of land plants. Hardwood is contrasted to softwood, which comes from conifers, cone bearing seed plants. Hardwoods are not alwa ...

                                               

Mahogany

Mahogany is a hard tropical wood from the Americas. It was discovered by Europeans early in the 16th century. The wood comes from a tree, Swietenia mahagoni. The tree is native to southern Florida and islands in the Caribbean including the Bahama ...

                                               

Mortice and tenon

A mortice and tenon joint is a type of joint that connects two pieces of wood or other material. Carpenters have used it for thousands of years to join pieces of wood. It is used when the adjoining pieces connect at an angle of 90°. In its basic ...

                                               

Oriented strand board

Oriented strand board, commonly called OSB, is a type of particle board which is made of carefully positioned strands of wood. Aspen and other similar woods are cut into long strands parallel to the grain of the wood. It is manufactured into shee ...

                                               

Particle board

Particle board, also known as particleboard and chipboard, is a wood product made from chips of wood or sawdust. It is mixed with resin or glue, then, under pressure and heat, pressed into uniform sheets. Particle board is used in building constr ...

                                               

Plywood

Plywood is a manufactured wood which is made by gluing several thin sheets of wood together with the grain alternately running along the sheet then across it. The veneer is usually about 3 millimetres thick for each layer. Interior layers of thes ...

                                               

Rattan

Rattan is the name for about 600 species of old world climbing palms. They belong to the subfamily Calamoideae. Rattan is also known as manila, or malacca, after the ports of Manila and Malacca City, and as manau from the Malay rotan manau, the t ...

                                               

Softwood

Softwood is wood that comes from gymnosperm trees. These are conifers, a term which includes most evergreen trees. Softwood makes up about 80% of the worlds production of lumber. Traditional production areas include North America, Scandinavia, Ba ...

                                               

Wood grain

Wood grain describes the alignment, texture and appearance of the wood fibres. This is often important in its effect on woodworking techniques. In describing the alignment of the wood in the tree a distinction may be made. Basic grain description ...

                                               

Latona Fountain

The Fountain of Latona is a fountain. It lies on the east-west alignment between the Palace of Versailles, the Apollo Fountain, the Green Carpet, and the Grand Canal. Latone faces west. The fountain was designed by Le Notre in 1666. The fountain ...

                                               

Trevi fountain

The Trevi fountain is a fountain in Rome. It lies in the Trevi district, from which it gets its name. The current fountain was built from 1732 to 1736 in Baroque style. At about 26 metres high and about 50 metres wide the Trevi fountain is Romes ...

                                               

Blizzard

A blizzard is a severe snowstorm. It brings low temperatures, strong winds, and a lot of blowing snow. Blizzards start when a high pressure system touches as low pressure system. The word blizzard is sometimes used incorrectly by news media to ta ...

                                               

Snow in Florida

The U.S. state Florida does not get snow very often. Most of the time, major cities in Florida do not get snowfall that can be measured. Some areas in the far north are able to get snow more often. The National Weather Service says that the Flori ...

                                               

Ice algae

Ice algae and snow algae are algae and cyanobacteria which grow on long-lasting snow and ice fields like glaciers. When liquid water is available between the snow and ice crystals, they may color the surface green, yellow or red during the summer ...

                                               

Snowball

A snowball is a ball of snow. They are usually made by a person picking snow up in their hands and pressing it together in the ball the size of their hand. Snowballs are usually thrown at people or objects as a game called a snowball fight. Makin ...

                                               

Vandiyur Mariamman Teppakulam

Vandiyur Mariamman Teppakulam is the temple tank located near to Vandiyur Mariamman Temple. It is situated at a distance of about 2 km from the Meenakshi Amman Temple. The tank is connected to Vaigai River through an underground channel. It has t ...

                                               

Cloud

A cloud is water vapour in the atmosphere that has condensed into very small water droplets or ice crystals that appear in visible shapes or formations above the ground. Water on the Earth evaporates turns into an invisible gas and rises up into ...

                                               

Funnel cloud

A funnel cloud is a funnel-shaped cloud of condensed water droplets. They usually appear with a rotating column of air. These extend from the bottom of a cloud that does not touch the ground or a water surface. A funnel cloud can usually be seen ...

                                               

El Niño–Southern Oscillation

El Niño-Southern Oscillation is a term for a natural event that takes place in the Pacific Ocean. It is also called El Niño and La Niña. In Spanish they mean "little boy" and "little girl". El Niño happens when the sea water temperature rises in ...

                                               

St. Elmos fire

St. Elmos fire is a weather event in which bright, glowing, ball of light is seen near pointed objects, like the mast of a ship. It is plasma made by a coronal discharge from a sharp or pointed object in a strong electric field in the air. These ...

                                               

Heat index

The heat index is a measurement which combines air temperature and relative humidity as being the human-perceived equivalent temperature - how hot it feels. The result is also known as the "felt air temperature" or "apparent temperature". For exa ...

                                               

Humidex

The humidex is a temperature index used by Canadian meteorologists to describe how hot the weather feels to a person, by adding the effect of heat and humidity. For example, if the temperature is 30 °C and the calculated humidex is 40, then that ...

                                               

Humidity

Humidity means water vapor in the air, but not to liquid droplets in fog, clouds, or rain. Deserts usually have low humidity, and tropical regions have high humidity. The word "humid" often means that the humidity is high, which gives the feeling ...

                                               

Cold front

A cold front is a meteorological word that is used to describe the movement of a cooler air mass into an area of warmer air. The air with greater density moves under the less dense warmer air, lifting it, which can cause a line of showers and thu ...

                                               

Hydrometeorological Prediction Center

The Hydrometeorological Prediction Center is one of nine Service Centers that are part of the National Centers for Environmental Prediction, which is part of the National Weather Service, which in turn is part of the National Oceanic and Atmosphe ...

                                               

Particularly Dangerous Situation

A Particularly Dangerous Situation is a type of enhanced wording first used by the Storm Prediction Center, a national guidance center of the United States National Weather Service, for tornado watches and eventually expanded to use for other sev ...

                                               

Weather map

A weather map is a tool. It shows facts about the weather quickly. Weather maps have been used from the mid-19th century, for study and for weather forecasting. Some maps show differences of temperature, and weather fronts. A station model is a s ...

                                               

Rain

Rain is a kind of precipitation. Precipitation is any kind of water that falls from clouds in the sky, like rain, hail, sleet and snow. It is measured by a rain gauge. Rain is part of the water cycle. Clouds will often absorb smoke to create rain ...

                                               

Thunderstorm

Thunderstorms are small, intense weather systems that make strong winds, heavy rain, lightning, and thunder. Thunderstorms can happen anywhere with two conditions: the air near the Earths surface must be warm and moist, and the atmosphere must be ...

                                               

BBC Weather

BBC Weather is the BBCs department in charge of preparing and broadcasting weather forecasts and is now part of BBC News. The broadcast meteorologists are employed by the Met Office. The longest serving presenter of BBC weather was Michael Fish, ...

                                               

Met Office

The Met Office is the United Kingdoms national weather service. More than 50% of its revenue comes from goods and services. This is why it is a trading fund of the Ministry of Defence. Part of the Met Office headquarters at Exeter in Devon is the ...

                                               

National Weather Service

The National Weather Service is one of the six scientific agencies that make up the National Oceanic and Atmospheric Administration of the United States government. Its job is to provide "weather, hydrologic, and climate forecasts and warnings fo ...

                                               

Tornado

A tornado is a tube of violently spinning air that touches the ground. Wind inside the tornado spins fast, but the actual circle of wind around them is huge. This makes tornadoes very dangerous. Tornadoes are especially dangerous to people in car ...

                                               

1980 United States heat wave

The 1980 United States heat wave was a period of strong heat and drought. It caused serious havoc and damage in the Southern Great Plains and much of the Midwestern United States during the summer of 1980. It was one of the most devastating and d ...

                                               

1988–89 North American drought

The 1988–89 North American drought was a weather problem that lasted two years. The drought began in 1988 in the Midwestern United States, High Plains and the Northeastern United States. A number of high pressure areas set themselves up over cert ...

                                               

Droughts in the United States

Droughts in the United States is similar to drought around other parts of the world. Below-normal precipitation leads to drought. Thats caused by an above average persistence of high pressure over a dry area. Drought in the United States occurs d ...

                                               

Enhanced Fujita scale

The Enhanced Fujita scale is a tornado category scale used to measure tornadoes in the United States and Canada by how bad their damage is. The National Weather Service started using it on February 1, 2007 and in Canada in April 2013. The weakest ...

                                               

Haboob

A haboob is a storm that forms in the downdrafts of a thunderstorm. The downdrafts are caused by air being pushed down onto the ground, similiar to a leaf blower. They can be seen in deserts like the Saharan and in places like Arizona. A thunders ...

                                               

Hailstone

A hailstone is a round ball of ice which falls out of a storm cloud. About 5.000 hailstorms a year in the United States of America make hail 3/4 of an inch or larger.

                                               

Ice storm

Ice storms are weather phenomena caused by freezing rain. The falling rain comes into contact with surfaces and turns into a thin sheet of ice. Ice storms cause accidents, take power lines down and cause serious damage.

                                               

Late-May 1998 tornado outbreak and derecho

The Late May 1998 tornado outbreak and derecho was a weather event in the United States from May 30-31, 1998. It affected the northern half of the country and southern Ontario, from Montana to the Mid-Atlantic states.

                                               

Monsoon

A monsoon is a seasonal wind which lasts for several months. The word was first used in English for the seasonal rains in the Indian subcontinent. These rains blow in from the Indian Ocean and Arabian Sea in the southwest bringing heavy rainfall ...