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What are the characteristics of a tornado?

A tornado usually moves from southwest to northeast. The length of its path averages 4 miles but reaches up to 300 miles, and the width of this path averages 400 yards. Tornadoes travel at a speed of 25 to 40 miles per hour. It typically originates from dark, heavy clouds with a swirling funnel-shaped pendant that extends to the ground. Preceding the storm, precipitation, hail and a heavy downpour usually occur. Tornadoes are generally characterized by a roaring, rushing sound like the noise made by airplanes or trains speeding through a tunnel.\nMost tornadoes in the United States occur from ..

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What are some pros and cons of mechanical energy?

Mechanical energy may be defined as a form of energy that relates to the position and movement of an object. This form of energy is classified into two categories. The first classification is potential energy, which is a form of stored energy based on an object's position in space. The second category is kinetic energy, defined as the energy generated as a result of the object's motion. These two classifications may also define mechanical energy as the ability to do work.\nMechanical energy is useful in manual activities, turning them into machine-driven work. A simple example of usi..

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How reactive is arsenic?

Arsenic does not react with water. Arsenic is stable when it is in dry air; however, it does oxidize in air. When it oxidizes, it occurs in moist air, and it gives a bronze-like tarnish to the element including a black covering. Arsenic reacts with halogens under controlled conditions. It reacts with fluorine (F2) and produces the gas pentafluoride arsenic fluoride when it reacts. It also will react with fluorine, chlorine, bromine and iodine.\nArsenic has two main forms and is a metalloid element. Its two main forms include a gray metallic form and a yellow non-metallic solid. It is the yello..

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Where do pine trees come from?

Red pine grows in areas around the Great Lakes and the St. Lawrence River. It has two needles per bundle, and it is the most planted pine in North America.\nThe shortleaf or yellow pine grows in 22 states, ranging from New York to Florida and inland to Oklahoma and Texas. It withstands a variety of soil and environmental conditions.\nPonderosa pines grow in the western United States, Canada and Mexico. They live in areas from the Plains States to the Pacific Coast.

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What is the molar mass of hydrochloric acid?

Hydrochloric acid was first described in the 16th century by Andreas Libavius. Major production of the acid began during the Industrial Revolution. The compound has been used as a chemical reagent in large-scale production of vinyl chloride for PVS plastic and polyurethane. The acid also can be used on a small scale for household cleaning.

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What caused Cyclone Tracy?

Cyclone Tracy killed 71 people and injured another 650 while displacing 41,000. It destroyed 80 percent of the buildings in Darwin. The total cost of the storm was projected at $586 million.

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How do people hear?

When sound waves reach the ear, they pass through the ear canal and reach the eardrum. The eardrum marks the end of the outer ear. When the sound waves hit the eardrum, they cause the eardrum to vibrate. This vibration of the eardrum is then amplified and transmitted through three little bones in the middle ear, and this group of bones is known as ossicles. From there, the vibration is transmitted to the inner ear, which is filled with fluid. The vibrations transmit through the fluid and reach a snail-shaped portion of the inner ear that's known as the cochlea.\nThe cochlea houses thousan..

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What types of atoms typically form covalent bonds?

Most bonds between atoms are at least somewhat covalent. Purely covalent bonds exist in molecules that contain only two or more atoms of the same element. Examples include oxygen, nitrogen, hydrogen and chlorine gases.\nMolecules only really exist where the bonds between atoms have covalent character, which means that the electrons are at least partially shared by the member elements of the molecule. In fully ionic bonds, as in table salt, the bond between the ions is purely based on opposite charge, and each sodium ion in a pure salt crystal can be said to share an equivalent bond with each c..

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Where is the prostate located?

The prostrate also creates a fluid that nourishes and protects sperm during ejaculation. The fluid combines with the sperm to create semen. Prostrate muscles help propel semen out during ejaculation.\nProstrates normally weigh about 20 to 30 grams, but when inflamed they can weigh up to 100 grams. An inflamed prostrate should be examined by a doctor, since it often is a symptom of prostrate cancer or other problems.

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How many bones are in a child's skeleton?

An infant's skeleton contains more cartilage than bone. During the growth of a child, most of the cartilage found in the skeleton begins to turn into bone through a process known as ossification. Other bones fuse together in to form larger bones that have the greater strength and durability that are necessary to support the heavier weight of a fully grown adult body.

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