Answer:
The inner core is a hot, dense ball of (mostly) iron. It has a radius of about 1,220 kilometers (758 miles). Temperature in the inner core is about 5,200° Celsius (9,392° Fahrenheit). The pressure is nearly 3.6 million atmosphere (atm)
The hardest mineral known to people is:
slate
granite
diamond
quartz
Answer:
The hardest mineral known to people is Diamond
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