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.
A: The United States Postal Service offers two regular mail delivery services, First Class and Standard Post. First Class mail is typically delivered within one to three business days, depending on the location. Standard Post is typically delivered within two to eight business days. First Class mail is used for letters and other small objects that fit into common envelope sizes. The maximum weight for First Class mail is 13 ounces. Mail can be sent internationally using First Class mail, but the delivery time varies based upon the location. Within the United States, First Class usually takes 1-3 days.