Final answer:
Conventional fossil fuels include coal, oil, and natural gas. Unconventional fossil fuels include oil sands, shale oil, and methane hydrates.
Step-by-step explanation:
There are two categories of fossil fuels: conventional and unconventional. Examples of conventional fossil fuels include coal, oil (petroleum), and natural gas. Coal is a solid fossil fuel, petroleum is a liquid fossil fuel, and natural gas is a gaseous fossil fuel. These fuels have been widely used and have a high energy density. Examples of unconventional fossil fuels include oil sands, shale oil, and methane hydrates. These fuels are more difficult to extract and require advanced technology and processes.