Question

which is the hardest fossil fuels​

Answer 1

Petroleum, or crude oil, is harder to find and is typically a bit cleaner-burning — and, unlike coal, it can be pumped through pipelines and easily refined into fuels like gasoline or kerosene. Natural gas is also relatively inexpensive and less polluting than coal or crude oil.Mar

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Answer 2

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ᴘᴇᴛʀᴏʟᴇᴜᴍ, ᴏʀ ᴄʀᴜᴅᴇ ᴏɪʟ, ɪs ʜᴀʀᴅᴇʀ ᴛᴏ ғɪɴᴅ ᴀɴᴅ ɪs ᴛʏᴘɪᴄᴀʟʟʏ ᴀ ʙɪᴛ ᴄʟᴇᴀɴᴇʀ-ʙᴜʀɴɪɴɢ — ᴀɴᴅ, ᴜɴʟɪᴋᴇ ᴄᴏᴀʟ, ɪᴛ ᴄᴀɴ ʙᴇ ᴘᴜᴍᴘᴇᴅ ᴛʜʀᴏᴜɢʜ ᴘɪᴘᴇʟɪɴᴇs ᴀɴᴅ ᴇᴀsɪʟʏ ʀᴇғɪɴᴇᴅ ɪɴᴛᴏ ғᴜᴇʟs ʟɪᴋᴇ ɢᴀsᴏʟɪɴᴇ ᴏʀ ᴋᴇʀᴏsᴇɴᴇ. ɴᴀᴛᴜʀᴀʟ ɢᴀs ɪs ᴀʟsᴏ ʀᴇʟᴀᴛɪᴠᴇʟʏ ɪɴᴇxᴘᴇɴsɪᴠᴇ ᴀɴᴅ ʟᴇss ᴘᴏʟʟᴜᴛɪɴɢ ᴛʜᴀɴ ᴄᴏᴀʟ ᴏʀ ᴄʀᴜᴅᴇ ᴏɪʟ.....♥