Each question in this quiz is timed.
How is the Mohs scale organised ?
Talc, plaster, calcite, fluorite, apatite, ortosa, quatz, topaz, corindon, diamond
diamond , calcite, corindón, plaster, quatz, apatite , fluorite, talc , ortosa, topaz
Is the quartz a silicate
does the crust have mineral components or rock components ? which ones ?
minerals like granit or basalt
rocks like marl and slate
