[ Grammar ]
—- of minerals, which are chemical elements or compounds of varying purity.
A. The consistency of rocks
B. Rocks, consisting
C. Rocks consist
D. Whereas rocks consist

Random Topics:
Subordination ConjunctionsFirst ConditionalsModals and Adjectives (ed-ing)Kinds of NounsNouns - Word Form-IONModalsPresent Simple Tense PassivePreposition of PlaceIn/On/At + TimeCoordinating ConjunctionsOther quiz:
Relative Clause › ViewDo you know the shop ____ Andrew picked me up?
A. where
B. which
C. that
D. whose
Tenses › View
… the meeting take place in your office?
A. Don’t
B. Does
C. Do
D. Done