Oil, coal, and natural gas are the three main types of fossil fuels.
Most people band miniature goats, but when they're big enough, you can use other tools. It is possible to castrate older goats; over 4months, without much trouble at all if you use a correct tool.weeks minimum age, but if you plan to neuter them later then 6weeks, remove the buckling(s) to a separate pen from their sisters/dams. They can breed as early as 7weeks, so you have to be very careful.
A castrated male goat is called a wether. An adult female goat is called a doe. Immature goats collectively are called kids. Male goats under one year of age are called bucklings, while female goats under one year of age are called doelings. The terms Nanny (female) and Billy (male) to differentiate the sexes are in general disfavor in official goat circles. Don't get caught saying these terms or you will be labeled an amateur.