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How many kinds of clay are there?

Clay has been used throughout history and serves a variety of purposes. Clay is commonly used by potters for making urns, dishware and decorative items. In its normal state, clay has a plasticity that is enhanced with water. Dry clay takes on a firm texture. When it is heated, such as in a kiln, its properties change, and it forms a ceramic material.

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What makes the color black?

The first black pigments were made with charcoal used in the Neolithic era and burnt vines used by the ancient Romans. Modern black dyes and pigments include iron oxide synthetics, bone char and synthetic nigrosin. Black inks were produced in China as early as the 23rd century B.C. when painters mixed plant material with dark minerals such as graphite.

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What does electricity do?

Wikipedia enumerates the many uses of electricity in both human technology and the natural world. Electricity provides heat and private and public lighting. Electricity is vital to many appliances, like televisions, radios, computers, refrigerators and washing machines. Even automobiles use electricity and have a battery for this purpose. In nature, animals use voltage pulses to transmit information along their cell membranes. Additionally, electricity can be used to revive someone. When a person's heart stops beating, physicians often stimulate it with a device known as a defibrillator, ..

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How do you build a carbon filter?

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How does acid rain affect plant growth?

Acid rain does not usually kill plants directly, although it does weaken the leaves of many plants. Instead, it tends to affect plants by limiting the nutrients they get or releasing toxins from the soil. These alone cause a plant to grow more slowly, but if it is combined with other environmental stresses, it can lead to death. Forests subjected to acid rain have been observed with browning and premature loss of leaves. Entire patches of forest are lost with acid rain as a contributing factor.\nAcid rain has a greater ability to dissolve some soil nutrients than normal rain, so it can easily ..

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What is John Dalton known for?

Dalton was extremely interested in meteorology. He often read his papers on meteorology to the Literary and Philosophical Society, and continued to do so from 1799 to 1801. In 1793, Dalton published his first book on meteorology, "Meteorological Observations." Dalton's extensive research on meteorology eventually helped in the development of his atomic theory proposal, which he launched two years after he stopped reading his papers at the Literary and Philosophical Society. Dalton also understood that atoms were different in weight and composition. Accordingly, he calculated atomic weight..

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What is GFCI protection?

GFCI protection constantly monitors the flow of power through the outlet, creating an always-on protection against shocks and potential burns or fires. Owners should test the outlets at least once a month by plugging an appliance into the receptacle, powering it on and pressing the test button. The button should cause the GFCI protection to trigger and immediately shut down the appliance. Additional testing after power outages or whenever mandated by the manufacturer’s instructions for the outlet can also prevent failure. Pressing the reset button turns the GFCI protection back on after a te..

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Where is pumice found in the world?

Since a large amount of pumice is formed under seas and oceans, it is common for it to wash ashore and to be discovered on beaches. However, there are also many land-locked places where pumice is found. A large amount of pumice was created when Mount St. Helens erupted, and the eruption of Mount Pinatubo in the Philippines in 1991 generated many cubic miles of material, much of which was pumice.\nPumice is excavated and shipped all over the world for use in architecture, concrete manufacturing, cosmetics and the production of filtration media for water treatment systems. It is also used to aer..

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What makes ice melt faster?

Substances that form a solution with water can alter the freezing point. Sodium chloride, for example, can create such a solution. The addition of salt to ice in a 10 percent solution lowers the transition point from 32 degrees Fahrenheit to 20 degrees. At temperatures above the transition point, the ice melts.\nIncreasing the pressure on ice causes it to melt. The ice at the bottom layer of a glacier is typically under so much pressure that it is always found as a liquid. This explains how glaciers flow, albeit at a slow rate.

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Is vinegar an acid or a base?

Balsamic vinegar is a prized and complex vinegar which is made from the must of Trebbiano grapes. The best types of balsamic vinegar are aged and enjoyed very much like fine wines. Balsamic vinegar contains no balsam. The name comes from Latin and Greek words that mean "restorative."\nVinegar can be flavored with nearly every sort of herb, including tarragon, basil, thyme, dill and mint.

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