XI. Phosphate Rock

Question 1

made up primarily of chloride, fluoride, carbonate, or hydroxyl forms of apatite, is the main source of phosphate in chemical fertilizers

Answer 1

Phosphate Rock

Question 2

Phosphate Rock: the most widespread and considered the most important, geologically and economically, are those of ____ origin

Answer 2

marine origin

Question 3

Phosphate Rock deposits in the country are associated with the—

Answer 3

old guano deposits

Question 4

Two types of phosphate deposits are recognized—

Answer 4

the guano-derived phosphate rock and the open-cut deposits

Question 5

found singly or in combination with guano

Answer 5

guano-derived phosphate rock

Question 6

exemplified by phosphorite associated with massive to poorly bedded, porous, coralline, and frequently fractured limestone formations of Pliocene to Pleistocene age

Answer 6

Open-cut deposits