If your Lincoln Memorial penny has a date before 1982, it is made of 95% copper. If the date is 1983 or later, it is made of 97.5% zinc and plated with a thin copper coating. For pennies dated 1982, when both copper and zinc cents were made, the safest and best way to determine their composition is to weigh them. Solid copper pennies weigh 3.11 grams (+/- 0.130 g.), whereas the copper plated zinc pennies weigh only 2.5 grams (+/- 0.100 g.).
Report Abuse. 1  Vibrations In Abdomen. Source(s): https://shrinkurl.im/a8czv. 2  For the best answers, search on this site https://shorturl.im/awgvM. If by stomach, you mean your abdomen, that's your intestines, and it's probably gas. 3  Sounds like it could just be little bubbles of gas.
Growling Is Part of the Migrating Motor Complex (MMC) If you hear your stomach growling, itâs likely because your stomach and intestines are engaged in a process called the migrating motor complex (MMC). This typically occurs when your stomach and intestines have been empty for about two hours.