1. Shale that is rich in humic acids

Type of: humate, shale

• steeper
• steepish
• steeple
• steeplechase
• steeplechaser
• steepled
• steeplejack
• steeply
• steepness
• steer
• steer roping
• steerable
• steerage
• steerageway
• steerer
• steering
• steering committee
• steering gear
• steering linkage
• steering mechanism
• steering system
• steering wheel
• steersman
• steeve
• steeving