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When was the last time Mount Etna erupted?

The latest eruption was not as explosive as the previous eruptions. It was milder compared to the gigantic fountains of lava that previous eruptions produced, especially in 2013. This eruption produced a flow of lava from the new southeast crater that snaked down the slopes of the mountain. Mount Etna is among the world's most active volcanoes and is in a nearly constant state of activity.

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What liquids conduct electricity well?

Electrolytes can also be grouped into strong and weak categories. Strong electrolytes will disassociate completely into their component ions when in an aqueous solution. Weak electrolytes do not disassociate completely, and as a result, their aqueous solutions do not conduct electricity well. Almost all of the inorganic salts, such as sodium chloride, are strong electrolytes. The strong bases also disassociate completely in water and produce hydroxide ions. Weak acids, such as acetic acid and citric acid, do not disassociate completely in water, and their solutions are not good conductors. Sim..

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What is the Lewis structure for C2Cl4?

C2Cl4 is tetrachloroethylne using the systematic naming system, but its common name is perchlorethylene. Perchloroethylene is a common dry cleaning solvent. As shown in its Lewis structure, it is nonpolar, making it an ideal solvent for many other nonpolar organic materials. The fact that it is nonflammable and highly stable makes it a preferred compound for use by dry cleaners. The solvent works on oils and greases, making it popular for cleaning metals.\nC2Cl4 dissolves fats in human tissues. It removes the fats from the skin, causing drying and irritation. It is readily absorbed through the..

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What are types of mollusks?

The seven classes of mollusks are Monoplacophora, Aplacophora, Gastropoda, Polyplacophora, Bivalvia, Scaphapoda and Cephalopoda. Limpets and abalones are part of the class Gastropoda. Chitons look similar to pill bugs, have eight outer plates and are part of the class Polyplacophora. Clams, oysters, mussels and scallops are part of the class Bivalvia, of which 80 percent are found in the ocean. Cuttlefish, octopods and nautiluses are part of the class Cephalopoda. This class has the most well-developed nervous system and eye of all the mollusks. Mollusks lack body segmentation, but they do hav..

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What is the anatomy of a tooth?

The crown is the visible portion of each tooth in the mouth, and the root of each tooth descends into the jaw below the gums. The white outer part of the crown tooth is known as enamel. Enamel is comprised almost entirely of calcium phosphate, a dense mineral that provides teeth their strength, and is formed by ameloblasts, explains Dentalcare.com. Enamel does not grow further or repair itself once it is completely formed, but it does have the ability to remineralize. Since enamel is semi-translucent, the color of teeth takes on the hue of dentin which lies underneath the enamel.\nDentin is fo..

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What causes volcanic eruptions?

Explosive eruptions occur when pressure builds up in magma chambers beneath volcanoes. This is often due to different types of magma mixing in the chambers. Lighter, less-dense magma naturally rises, but if a bubble of lighter magma builds beneath a more dense, viscous reservoir of magma, the pressure can build up inside the chamber. Eventually, it becomes enough to force the heavier magma through the volcano's vent, causing an explosive eruption.\nAn eruption can also occur due to a collapse of the cinder cone of the volcano. Over time, lava flowing out of a volcano builds up more and mo..

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What is the bacillus Subtilis gram stain?

According to Textbook of Bacteriology, the bacillus Subtilis resists destaining and staining, meaning that it holds the dye placed into a patient's body and remains visible to tests once stained but is difficult to stain to begin with. Because of the ability to differentiate between diseases and infections through the dyes, several dying procedures, like the Schaeffer-Fulton staining method, can differentiate between the endospore and things like sporangia or vegetative cells. Endospores have a high resistance to chemicals and heat.

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How many inches are in 50 centimeters?

An alternative way to find the answer is to use the fact that 0.3937 inches is equal to 1 centimeter. In this case, you can simply multiply 50 centimeters by the factor 0.3937 inches to arrive at the same answer of 19.685 inches.\nConversion charts, tables or online conversion calculators are very useful when converting measurements between the Imperial to the metric system or vice versa.

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What type of pulley is on a flagpole?

With fixed pulleys, the force needed to raise a load is equal to the force of gravity pulling the load weight downward. This is the simplest type of pulley and offers no mechanical advantage by itself.\nOther types of pulleys include movable pulleys and compound pulleys. A movable pulley has the wheel and axle directly attached to the load, while either end of the rope is pulled upwards from the load. Simple movable pulleys have a mechanical advantage of two. A compound pulley is a combination of fixed and movable pulleys. This type offers the greatest amount of mechanical advantage.

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How do volcanoes affect the Earth's atmosphere?

These effects are due to the large amounts of ash and debris that are released during the eruption, which attract water molecules from the atmosphere. This leads to the formation of clouds and eventually rain. Scientists are still not sure exactly what causes the increase in lightning, but the most accepted theory is that the ash separates into positively and negatively charged particles as it moves through the air.\nEruptions can also lead to large amounts of volcanic fog, as in the case of Hawaii. Volcanoes also release large amounts of sulfur dioxide, which leads to acid rain when it mixes ..

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