Damascus Steel

Damascus Knife

Boot Knife

Blueberry Hill (3 points- also a song title and location)

Grapevine Hill

Hill People

Big Hill

Steep Hill

Hill Country (an area in west texas)

Gravity Hill

Zero Gravity

Heavy Gravity

Heavy Fuel (2 points also a song by Dire Straits)

Heavy Metals 

Precious Metals

Ferrous Metals

Ferrous Oxide  (what happens to most cars in the NE)

This post was edited by RexTheRoadDog at March 19, 2018 3:33 AM PDT

Ferrous Sulfate

Sodium Sulfate

Sodium Chloride

potassium chloride

Calcium Chloride