UNIVERSE
PLANETARY INTERIORS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Earth’s inner core is ____
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a dense ball of solid iron and nickel.
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a layer of molten iron and nickel.
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a layer of hot rock.
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a layer of rock that forms Earth’s outer skin.
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Explanation:
Detailed explanation-1: -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).
Detailed explanation-2: -The outer core is mainly composed of a nickel-iron alloy (liquid iron), while the inner core is almost entirely composed of a pure solid iron body. Scientists believe Earth’s magnetic field results from movements of molten iron and nickel within its liquid outer core.
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