All fossil fuels require a certain amount of energy input to get them out of the ground and process them in usefu Toms, Which of the following energy sources generally requires the most energy before it can be usec fuel? Tar Sands Oil Natural gas Coal

## Step 1
The problem is asking us to identify which among the given options (Tar Sands, Oil, Natural Gas, and Coal) requires the most energy input before it can be used. The energy input is the amount of energy required to extract and process the fuel.

## Step 2
Tar Sands: These are a type of unconventional petroleum deposit. The extraction process involves mining the sands and then using a process called hot water extraction to separate the bitumen. This process requires a significant amount of energy.

## Step 3
Oil: Oil is a liquid fossil fuel that is extracted from the earth through drilling. The process of drilling and refining oil requires energy, but it is generally less energy-intensive than extracting tar sands.

## Step 4
Natural Gas: This is a gaseous fossil fuel that is extracted through drilling. The process of drilling and refining natural gas requires energy, but it is generally less energy-intensive than extracting tar sands or oil.

## Step 5
Coal: Coal is a solid fossil fuel that is extracted through mining. The process of mining and refining coal requires energy, but it is generally less energy-intensive than extracting tar sands.

## Step 6
Comparing the energy inputs required for each of these processes, it is clear that the extraction of tar sands requires the most energy. This is due to the additional steps involved in the extraction process, such as mining the sands and using hot water extraction.