Main content
Fuel types and uses I
Problem
Fossil fuels are usually found below ground, and humans use a variety of methods to extract them.
Which of the following extraction methods are commonly used to remove coal from the earth?
Related content
If you're seeing this message, it means we're having trouble loading external resources on our website.
If you're behind a web filter, please make sure that the domains *.kastatic.org and *.kasandbox.org are unblocked.