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What is a person who studies rocks called?

Geologists study rocks to discover metals and minerals and develop ways to remove the metal and minerals from the rocks. They also study rocks to determine the ages of landmarks and other places on Earth.Geology covers a wide range of areas and most geologists choose a field of study specific to their interests. For example, a geologist may specially study volcanoes. The geologists would study the structure of volcanoes, the eruptions and possibly predict future eruptions.

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Why are volcanoes so dangerous?

Volcanic hazards can be grouped into three categories: ejecta, flow hazards and water hazards. The best-known hazards of living near a volcano are the risks associated with ejecta. Most volcanoes vent dangerous gases, such as sulfur dioxide and hydrogen sulfide, that are toxic to animals. Volcanoes also eject ash and chunks of debris called tephra that can fall out over hundreds of square miles and bury everything in their path. Lava usually flows slowly, but it is glowing hot and burns through everything it comes into contact with.\nFlow hazards around a volcano involve rockslides of various ..

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What is the chemical formula for limestone?

Calcium carbonate is commonly known as calcite,and calcium-magnesium carbonate is commonly known as dolomite. In nature, limestone deposits are very rarely composed of pure calcite or pure dolomite, although such deposits have been found.\nUnder the academic definition of limestone, any sedimentary rock with at least 50 percent calcite and dolomite content is considered limestone. Under the common commercial definition, sedimentary rock must contain at least 80 percent calcite and dolomite to be defined as limestone.

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How do bone growth stimulators work?

Bones generate an electrical field when broken or bent. This low-level electrical field is the body's natural method of stimulating bone healing. When this healing fails to occur naturally, bone growth stimulators are used to aid in the process. These devices are essential to the success of any spinal fusion surgery.\nDuring a spinal fusion, multiple bone fragments must heal together or fuse to create a solid bone. Fusion does not happen immediately at the time of surgery, but it is a process that occurs over time. Eventually, the bone growth process unites the bone graft pieces into one ..

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How do satellites work for kids?

The antennas located on the ground that send and receive signals are called earth stations. These earth stations are placed in various locations around the world. The area served by the satellite depends on the range of the earth station. The signals that travel from the antenna, or earth station, up to the satellite are called uplinks. The signals that travel from the satellite back down to the Earth are called downlinks.\nIn most cases, the uplink station sends a signal up to the satellite that contains video or audio programming. After receiving the signal, the satellite makes the signal st..

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Why is carbon dioxide used in fire extinguishers?

Carbon dioxide extinguishers work because carbon dioxide molecules are heavier than oxygen molecules. When the liquid carbon dioxide inside the extinguisher expands into a gas, the carbon dioxide pushes out any oxygen surrounding the fire. Without oxygen available to fuel the chemical reaction, the fire goes out quickly. This property can also make them dangerous in confined spaces since the carbon dioxide also pushes out any oxygen that the user needs to breathe.\nIn addition to carbon dioxide extinguishers, fire extinguishers use other methods to put out fires. Wet extinguishers spray a liq..

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What are fun facts for polonium?

The isotope with the longest half-life is Po209. Its half life is about 125 years, give or take three years.\nAll the isotopes of polonium are radioactive. This means the nucleus of the polonium isotopes gives off ionizing radiation such as alpha, beta or gamma rays.\nPolonium is a silvery, solid metal or metalloid at standard temperature and pressure, but is very rarely found in nature. It's the result of the decay of bismuth that's found in pitchblende. Polonium serves no purpose in supporting biological processes and has little use in chemistry and industry. Polonium also doesn&ap..

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What is ecological assessment?

Ecological assessment provides an unbiased platform of determining success or failure of the ecosystem and helps in developing improved management options. It is useful in supporting several types of actions, such as regulation of hazardous waste sites, pesticides and industrial chemicals. In addition, it helps in the management of watersheds and other ecosystems affected by diverse physical, chemical and biological stressors and predicts those stressors' future effects.

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What is the scientific name for a fox?

Foxes are a carnivorous mammal. They thrive off smaller mammals and often prey on small farm animals, such as chickens and other birds. While they are carnivorous, they are able to eat nearly anything that would be found in the wild such as waste from other animals and berries. Foxes that are in the wild prefer to eat rabbits rather than moles and mice. They have a predatory instinct and will be able to chase nearly any type of animal until they get what they want out of the chase: a meal.\nThe fox is one of the most widespread species throughout the world. They are found in every location in ..

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Why does the tail of a comet always point away from the sun?

As the comet travels, the solar energy elevates the state of matter of the nucleus. Previously frozen carbon dioxide sublimates as a result, while liquid water turns to vapor. In the process, the comet releases other organic molecules that the crystals of ice and dry ice had previously held in place.

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