### substance | sandstone:

Greensand
* also improves soil moisture retention.
* are sandstones.
* contains marine potash plus silica, iron oxide, magnesia, lime, and phosphoric acid
  - vitamins and minerals, including potash, phosphate and many trace minerals
* is marketed as a soil conditioner
  - mined in New Jersey from a geologic marine layer
  - relatively low in potassium, which is readily dissolved
  - the pulverized rock of a sandy clay material called iron potassium silicate
* natural ion exchange material which is capable of softening water.

Grit
* Some grit contains calcium.
* acts as an internal grinder, milling foods down in the bird's stomach.
* are high in iron and have no fat and no cholesterol
  - raw or partially cooked soybeans that have been cracked into eight or ten pieces
  - small broken grains of corn
* helps grind up coarse vegetable matter.
* is cereals
  - courage
  - located in carpets
* taken up with foodstuffs probably serves as an abrasive to aid in mastication.

### substance | sandstone | grit:

Insoluble grit
* assists the bird in digestion of seed.
* remains in the gizzard and is thought to aid in the mechanical breakdown of food.

### substance:

Sealant
* Some sealants are preferable for indoor use due to their lower emission rates
  - contain stain to tint the color of the deck
* are a clear or white material, which is applied on the biting surfaces of the teeth.
* are a plastic a plastic coating that protects teeth against decay
  - material used to prevent cavities from forming
  - resin material that are applied to mostly molar teeth in the back of our mouths
  - safe, effective and economical way to prevent cavities
  - valuable aid in the prevention of dental disease
* are also rough on plants
  - significantly less costly than fillings
  - an economical preventive measure to keep teeth healthy for years
  - clear plastic fluids that are painted onto the tooth
  - cosmetically pleasing because they are clear or white in color
  - important tools against tooth decay
  - less costly than fillings or other dental procedures
* are most effective in reducing cavities in children with newly formed permanent teeth
  - when applied to new molars before cavities have time to develop
  - painless and cost-effective, and can be applied in just a few minutes per tooth
* are thin plastic coatings brushed on the chewing surfaces of teeth
  - plastic-like coating applied to the chewing surfaces of the molars
  - thin, plastic coatings painted on the chewing surfaces of the back teeth
* block liquids from seeping into the granite.
* can also stop small areas of decay from becoming larger.
* can be clear, white or slightly tinted
  - very effective in preventing more costly dental procedures in the future
  - white, clear, or opaque in colour and feel smooth when touched
  - normally last up to five years and hold up very well under normal chewing
  - offer major protection against cavities
* cover the pits and grooves and create a barrier to the bacteria that cause decay.
* form a barrier that keeps food and bacteria out of tiny grooves in the tooth.
* help prevent decay from forming on the chewing surface of teeth
  - minor leaks, foaming, and lubricate water pump seals
  - to maintain sound, intact teeth
* offer an effective way to block tooth decay in certain areas.
* prevent cavities on the biting surfaces of molars, where most cavities occur.
* provide an added layer of protection against cavities for children and adults
  - strong, flexible seals in maintenance, maring and industrial applications
* vary somewhat in their longevity.
* work by filling in the crevasses on the chewing surfaces of the teeth.