1. Shale that is rich in humic acids

Type of: humate, shale

• discredit
• discreditable
• discreditably
• discredited
• discreet
• discreetly
• discreetness
• discrepancy
• serpent
• serpent fern
• serpent star
• serpent-worship
• Serpentes
• serpentine
• serpiginous
• Serra
• serranid
• serranid fish
• Serranidae
• Serranus
• Serranus subligarius
• Serrasalmus
• serrate
• serrate leaf
• serrated