GK
GENERAL SCIENCE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Iron and Nickel
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Nickel and Silicon
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Silicon and Iron
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Iron and Magnesium
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Detailed explanation-1: -Unlike the mineral-rich crust and mantle, the core is made almost entirely of metal-specifically, iron and nickel. The shorthand used for the core’s iron-nickel alloys is simply the elements’ chemical symbols-NiFe. Elements that dissolve in iron, called siderophiles, are also found in the core.
Detailed explanation-2: -Iron, nickel, and other heavy metals like gold, are what makes up the core of the earth because they are the heaviest of the metals and so sank toward the center of the earth.
Detailed explanation-3: -The deepest layer is a solid iron ball, about 1, 500 miles (2, 400 kilometers) in diameter. Although this inner core is white hot, the pressure is so high the iron cannot melt. The iron isn’t pure-scientists believe it contains sulfur and nickel, plus smaller amounts of other elements.