Related Clues:

• It's only to the North that it's not natural
• One gets the thread of this only south of the North
• Is the North only a mixture that's synthetic?
• It's only synthetic next to the North
• The North only makes stuff like this
• How one dug up the stuff, explosively
• That's the stuff they've got up out of the ground
• The North can only produce this synthetically
• Being synthetic, it's made of only Nitrogen
• The North gets what's only all synthetic
• How the North is only synthetic
• The North is only twisted to a material extent
• Is the North only synthetic?
• It's only synthetic below the North
• Is the North only synthetic? (5)