Earth science what would happen if you rubbed a piece of calcite (hardness 3) against a piece of quartz (hardness 7)? a.) calcite would break into three directional cleavage b.) calcite scratches quartz c.) quartz would cause a streak on calcite d.) quartz scratches calcite

answer: option d : 3.85 units

step-by-step explanation: in the given figure the blue line is diameter   .the diameter is the blue line which equals 7.7 units.radius is half of diameter .radius = 7.7÷2=3.85 units.

option d is the right answer.

explanation:

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the answer is:

c. islam and christianity

explanation:

islam and christianity are widely practiced in africa. islam is practiced due to its spread from the middle east into africa, and christianity is practiced due to the colonization of africa by the british empire.