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 Standard silver is an alloy of 92.5% silver and 7.5% copper called sterling silver . Another ancient use of silver was to make coins. Silver has been used as money for thousands of years. Today, few coins are still made from silver because of its high cost.   Sterling silver is an alloy of silver containing 92.5% pure silver and 7.5% of other metals, usually copper. Silver jewelry marked with a 925 is sterling silver jewelry that has been certified to contain 92.5% silver content. Silver      is mined from the minerals acanthite (silver sulfide) and stephanite. Silver also is found in the common minerals chlorargyrite (silver chloride) and polybasite. Silver is mined in many countries, but most comes from the USA , Canada , Mexico , Peru and Bolivia . Silver is the 68th most abundant element in the Earth's crust and 65th in cosmic abundance. It is found in small quantities in many locations on Earth. Large amounts of the metal have b...

Most gold used in jewelry is alloyed with silver , copper , and a little zinc to produce various shades of yellow gold or with nickel, copper , and zinc to produce white gold.   Gold is a soft, dense, yellow metal.  Its chemical symbol is Au. Its atomic number is 79. As a precious metal, it has been used for many thousands of years by people all over the world, for jewelry, and as money.   Scientists have long known that veins of gold are formed by mineral deposition from hot fluids flowing through cracks deep in Earth's crust. But a study published today in Nature Geoscience 1 has found that the process can occur almost instantaneously — possibly within a few tenths of a second. Gold is primarily found as the pure, native metal. Sylvanite and calaverite are gold-bearing minerals. Gold is usually found embedded in quartz veins, or placer stream gravel. It is mined in South Africa , the USA (Nevada, Alaska), Russia, Australia and Canada   Gold is metall...

knowledge want: WHAT IS GOLD : Most gold used in jewelry is alloyed with silver , copper , and a little zinc to produce various shades of yellow gold or with nickel, coppe...

Your personal privacy on the Web might be not  secure. Web browsing habits are tracked via cookies, search engines routinely change their privacy policies, and there are always challenges to Web privacy by both private and public organizations. Here are a few common sense tips that can help you guard your Web privacy and stay safe online.  /> Avoid Unnecessary Forms Online - Don't Give Out Too Much Information  A good Web safety rule of thumb is to avoid filling out forms that require personal information in order to keep anything from being entered into public, searchable record, aka Web results. One of the best ways to get around companies getting your personal information is to use a disposable email account c - one that you don't use for personal or professional contacts - and let that be the one that filters things such as contest entries, websites that require registrations, etc. That way, when you ge...

Here   are  some websites   that  are  really  informative   and   entertaining ,which  you can  bookmarked   for  future  reference.   A great blog for anyone looking to streamline their life, Lifehacker provides tricks and tips for getting stuff done. Whether you need tips to help with time management or a shortcut to completing a certain task, Lifehacker is a great site that can help you solve almost any problem. Visit Lifehacker. Reddit .   Reddit is a social news site. Simply subscribe to threads based on topics of interest (or even your geographical location) to see the best user-submitted topics rise to the top. You can contribute links to the community as well, plus choose to get involved with the discussions if you want. Visit Reddit. Product Hunt   Want to be the first to know about the best new products and services that launch? Product Hunt i...

  (adsbygoogle = window.adsbygoogle || []).push({}); style="display:block" data-ad-client="ca-pub-6386025966277781" data-ad-slot="9298941722" data-ad-format="auto" data-full-width-responsive="true"> (adsbygoogle = window.adsbygoogle || []).push({}); A password manager is an application that can generate, store  securely, retrieve, and manage passwords and other login credentials.  It helps   keeping your privacy safe while browsing the web and accessing your favorite online services.  Password managers let you collect and store all of your passwords and login information for various accounts in one easy-to-access app that can log you in to any service you have subscribed to with just a couple of clicks or taps.   Password managers are the safest way to keep track of your passwords, as they allow you to use stronger passwords without needing to memorize anything. Security experts generally...

knowledge want: HOW TO PROTECT YOUR DEVICE FROM HACKERS : Hackers are criminals who gain unauthorized access to a network and devices, usually with the intent to steal sensitive data, such as fina...