They observe properties of rocks and minerals that have practical applications, such as the color of minerals for use as in crayons, minerals used as abrasives in toothpaste, and the absorbent properties of clays used in kitty litter.
(They; observe; properties of rocks and minerals that have practical applications, such as the color of minerals for use as in crayons,) (properties of rocks and minerals; have; practical applications, such as the color of minerals for use as in crayons) (minerals; used; as abrasives in toothpaste) (clays; used; L:in kitty litter)
They properties of rocks and minerals minerals clays
observe have used used
properties of rocks and minerals that have practical applications, such as the color of minerals for use as in crayons,
practical applications, such as the color of minerals for use as in crayons
as abrasives in toothpaste
L:in kitty litter