According to mohs hardness scale, which of these groups of minerals can scratch fluorite? \

B.  Calcite, quartz, and topaz

C. Apatite, orthoclase, and corundum

D.  Diamond, gypsum, and quartz

 ANSWER

According to the Moh's hardness scale, the group of minerals that can scratch flourite are: APATITE, ORTHOCLASE AND CORUNDUM. The correct option is C. Moh's hardness scale is used to measure the resistance of a smooth surface to scratching. The scale ranges from 1 to 10, with talc having the hardness of 1, which is the softest and diamond having the value of 10, which is the hardest. All the three minerals listed in option C are above flourite in form of hardness so they can scratch fluorite.

label a cell membrane

label b cytoplasm

label c ribosomes

label d dna

the membrane forms the outside of the cell

cytoplasm is the liquid within

ribosomes are the components within that distribute rna

the dna is the genetic make-up

the corpus luteum secretes estrogens and progesterone. the latter hormone causes changes in the uterus that make it more suitable for implantation of the fertilized ovum and the nourishment of the embryo. if the egg is not fertilized, the corpus luteum becomes inactive after 10–14 days, and menstruation occurs.

i hope this : )