( 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 ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (PRP They)) (VP (VBP observe) (NP (NP (NNS properties)) (PP (IN of) (NP (NNS rocks) (CC and) (NNS minerals))) (SBAR (WHNP (WDT that)) (S (VP (VBP have) (NP (NP (JJ practical) (NNS applications)) (, ,) (RRC (PP (JJ such) (IN as) (NP (NP (DT the) (NN color)) (PP (IN of) (NP (NP (NNS minerals)) (PP (IN for) (NP (NN use))))))) (PP (RB as) (IN in) (NP (NNS crayons)))) (, ,) (NP (NP (NNS minerals)) (VP (VBN used) (PP (IN as) (NP (NP (NNS abrasives)) (PP (IN in) (NP (NN toothpaste))))))) (, ,) (CC and) (NP (NP (DT the) (ADJP (JJ absorbent)) (NNS properties)) (PP (IN of) (NP (NP (NNS clays)) (VP (VBN used) (PP (IN in) (NP (NN kitty) (NN litter))))))))))))) (. .)))
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.
(ROOT (S (SBAR (IN Although) (S (NP (PRP it)) (VP (VBZ is) (NP (DT the) (JJS easiest) (S (VP (TO to) (VP (VB observe)))))))) (, ,) (NP (NN color)) (VP (VBZ is) (RB not) (ADJP (JJ ideal) (PP (IN as) (NP (DT a) (JJ sole) (NN way)))) (S (VP (TO to) (VP (VB identify) (NP (NNS minerals)))))) (. .)))