Car exhaust is an unhealthy result of fossil fuel use. Photo Credit exhaust fulmes image by bilderbox from Fotolia.com. Fossil fuels are among the most commonly used forms of energy in the world. Common fossil fuels include natural gas, coal and petroleum, which is refined to create gasoline.Although fossil fuels are strong sources of energy, their use can pose certain health problems if handled incorrectly.ar exhaust is an unhealthy result of fossil fuel use. Photo Credit exhaust fulmes image by bilderbox from Fotolia.com. Fossil fuels are among the most commonly used forms of energy in the world. Common fossil fuels include natural gas, coal and petroleum, which is refined to create gasoline.
First-Class Mail International is a USPS trademark. Note: The cost of postage will appear on all international shipping labels. Maximum weight for letters is 3.5 ounces. Maximum weight for large envelopes is 4 pounds.
First-Class letter dimensions: Rectangular At least 3-1/2 inches high X 5 inches long X .007 inch thick No more than 6-1/8 inches high X 11-1/2 inches long X 1/4 inch thick Maximum weight is 3.5 ounces Letters that are considered nonmachinable are subject to a surcharge. Length is the dimension parallel to the address. To qualify for First-Class Mail card rates, a card must be: â¢ Rectangular â¢ At least 3-1/2 inches high X 5 inches long X 0.007 inch thick â¢ No more than 4-1/4 inches high X 6 inches long X 0.016 inch thick Length is the longest dimension parallel to the address.