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How do scientists think the moon was formed?

The scientific community places the most credence on the giant impact hypothesis. Scientist believe that a Mars-sized body called Theia crashed into the Earth, yielding rocky debris that eventually coalesced to form the moon. Many scientist base their support of this theory on the composition of the moon. It is made of lighter elements that suggest that is was created from light debris from Earth's crust and not heavier elements found nearer the Earth's core.\nThe capture theory states that the moon was formed in another part of the universe and was captured by Earth's gravity ..

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Why are steroids considered lipids?

Steroids are a class of lipids, but there are many different steroids. They differ based on the chemical units that attach to the four base rings. One well-known steroid is cholesterol, which is necessary in the body to manage inflammation. Some steroids are used for medicinal purposes, while others are used to promote muscle growth, which are called anabolic steroids.

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How many electrons does silver have?

An atom of silver has five energy levels. There are two electrons in the first energy level, eight in the second, 18 each in the third and fourth and a single electron in the fifth level. Silver is classified as a transition metal and is in group 11 on the periodic table. Its minimum oxidation number is 0, and its maximum oxidation number is 3.

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How are typhoons made?

During the early stages of cyclone development, rising warm air brings moisture into the upper levels of the atmosphere, creating clouds and feeding a rain system. Once the air cools, it falls outside the central column of rising air, spiraling as it descends. The rising air in the center of a storm creates a low pressure zone, and outside air rushes in to fill it, drawing more energy into the storm system. As long as the surface conditions remain warm and calm, the storm can grow in strength.\nHurricanes, typhoons and tropical cyclones are all essentially the same type of storm. Cyclones that..

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Can warm air hold more water vapor than cold air?

Relative humidity is the amount of water vapor in the air in comparison to what the air can hold. A relative humidity of 40 percent means that the air is only 40 percent saturated with moisture and can hold more water vapor.\nIn general, for each 20 F decrease in temperature, the relative humidity doubles. This means that as the temperature goes up, the relative humidity decreases; in other words, with the same amount of water vapor, cold air is more saturated than warm air.

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What is vibratory motion?

Types of vibratory motion include forced vibratory motion and free vibratory motion. An example of free vibratory motion is when a child is on a swing and the swing is let go after a push. Two other basic forms of motion include translator motion, which is along a path or straight line, and rotary motion, which is around a central point in concentric circles.

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What makes an insect an insect?

The body of an insect is divided into the head, the thorax and the abdomen. The head contains the insect's mouth parts, eyes and antennae. The thorax holds the legs and the muscles used in locomotion. The abdomen holds the digestive and reproductive organs.\nThe exoskeleton is made out of a tough material made of chitin. To grow, the insect must shed this exoskeleton or moult from time to time.

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How is wind chill temperature calculated?

The National Weather Service adopted its current formula for calculating wind chill on November 1, 2001. Before 2001, the service used a formula that dated back to 1939. The newer formula is the result of increased scientific knowledge and of experiments that tested how fast the faces of volunteers cooled in a wind tunnel under various combinations of wind speed and temperature. Experts believe that the newer formula is better at describing the wind chill effect from a scientific perspective.\nWind chill is a naturally occurring phenomenon in which wind blowing across exposed skin draws heat a..

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What is the common name for acetic acid?

Acetic acid consists of two carbon atoms, two oxygen atoms and four hydrogen atoms. In addition to being used to create vinegar, it is also used in certain commercial manufacturing processes, most notably to produce some plastics and paints. Acetic acid is most commonly created by mixing carbon monoxide with methanol. However, vinegar can also be synthesized directly by fermenting ethanol with acetic acid bacteria.

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What are examples of pathogens?

Bacterial pathogens are microscopic living organisms that cause negative health effects or disease when they enter a host. Most bacteria are harmless or even beneficial to humans, but some common bacteria that are dangerous are myobacterium tuberculosis, staphylococcus and streptococuss, which causes a wide range of diseases, including strep throat, pink eye and pneumonia.\nViral pathogens differ in that they replicate only in the cells of living organisms, including bacteria, and are more frequently damaging to their host. They also cannot be treated with antibiotics. Some examples include co..

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