Science

Refine Search

Where do volcanoes come from?

The molten rock under the Earth's crust is called magma. At points where the crust is weak or thin, magma pushes the ground upward to form a volcano. At the point at which the force of the magma is stronger than the crust, the magma explodes through the crust to form a volcanic eruption. The magma that flows out of a volcano is called lava. Lava usually starts flowing after the gases and ash have stopped exploding outward.\nVolcanoes also throw out rocks in other forms such as ash, cinder and pumice. Volcanic mountains are formed when the lava around a vent or crack hardens and solidifies..

Continue Reading

What are compression waves?

When a compression wave travels, it follows along the path of the wave, but will never surpass the length of it. Additionally, the wave follows the same vibration pattern as its successor. These waves are often pressurized as seen with sound waves. When the wave compresses and reaches a range of pressures, sound is made audible. People are susceptible to hearing sounds of various pressures and densities as made by the compression waves.

Continue Reading

What kind of plant is the bamboo?

The bamboo plant is used for a number of purposes in Southeast and East Asia. Bamboo seeds are consumed as grain and the young shoots are cooked and eaten as a vegetable in Chinese cuisines. Raw leaves from the plant are often used as a fodder for animals. Various bamboo species, including the Bambusa arundinacea and Dendrocalamus strictus, are used in the process of producing fine-quality paper.

Continue Reading

Can animals see in the dark better than humans?

Some animals, such as cats, owls and frogs, have pupils that cover the entire eye when wide open. Nocturnal animals have a special layer behind the retina, called the tapetum, which allows them to use even small amounts of light to see. When light passes through the retina, it reflects back off the tapetum, which makes the animals eyes seem to glow in the dark.\n\nWhile some animals can see better in the dark, they do have trouble focusing on specific images in many cases. Instead, they see a range of shadows and are able to detect movement. In addition, some animals, including dogs, only see ..

Continue Reading

What is low-voltage wiring?

'Low voltage' is not an official term used by U.S. Occupational Safety and Health Administration standards or regulations. Though the term is not used in OSHA information resources, OSHA lifts restrictions on equipment operating with fewer than 50 volts in select contexts, thus acknowledging the concept of low voltage systems without categorizing or labeling them as such. The restrictions lifted generally involve the risk of accidents causing damage to equipment or personnel.\nSystems conducting fewer than 50 volts are sometimes known by electricians as "extra-low" or "ultra-low" vol..

Continue Reading

How many valence electrons does chromium have?

Louis-Nicholas Vauquelin discovered chromium in 1797. The symbol of chromium is Cr, and fresh chromium is lustrous. It is a bluish white transition metal at room temperature, and is placed in Group 6 or d-block and Period 4 of the periodic table of elements. It is hard, brittle and does not corrode easily. It can be used to form a protective coating over other metals due to its anti-corrosive property. The atomic weight of chromium is 51.6661 atomic mass units, and its melting point is 3465 degrees Fahrenheit. The density of chromium is 7.15 grams per centimeter cubed.\nChromium has multiple v..

Continue Reading

What substances dissolve in water?

A general outline and list of exceptions, known as the Solubility Rules, can help determine if a particular ionic compound dissolves in water or not. Some of the rules include all salts formed by group I elements as water-soluble and all carbonate salts as insoluble, except when bonded with ammonium or a group I element. Water's ability to dissolve and dissociate substances comes from its polarity.\nIn every water molecule, the bonds between the hydrogens and oxygen exhibit a dipole shift, which means that, although they are sharing electrons, they are not sharing them evenly. As a result..

Continue Reading

What are the causes of pollution?

The introduction of pollutants into the air, water or soil is called pollution. The burning of fossil fuels to power industries and vehicles is a major cause of pollution. Generating electrical power through thermal power stations releases huge amounts of carbon dioxide into the atmosphere. As global population increases, the demand for fossil fuels increases causing additional pollution.\nWater is polluted through the use of toxic chemicals that are then discharged into water sources such as lakes, rivers and streams. Underground water is also polluted due to such toxic chemicals.

Continue Reading

How is magma believed to originate?

The structure of the earth's internal components plays a large role in determining whether or not magma will form in a certain area and how much will be generated. Beneath the earth's surface are active seismic waves, which are produced by earthquakes around the world. Like the earthquakes themselves, these seismic waves vary in force and velocity. They also vary in length and physical composition, which influences how far they travel. These waves come in several forms, including body waves and surface waves.\nBody waves travel through the middle layers of rocks, while surface waves,..

Continue Reading

What are some tips for learning physics?

Many physics problems require plugging data from a word problem into a formula and solving mathematically. However, it is ineffective to try simply memorizing all of the formulas without understanding the concepts behind their applications, warns Oberlin College Physics Department. Students are more likely to identify the correct equation to apply to an exam problem if they put in the study time to truly understand the scientific logic behind the mathematical techniques covered in the class.\nAt the same time, students who do not have the appropriate math background may struggle to calculate t..

Continue Reading
Showing 7551 to 7560 of 10000 (1000 Pages)