UNIVERSE
PLANETARY INTERIORS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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The outer core is liquid, the inner core is solid.
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The inner core is liquid and the outer core is solid.
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The outer core is made of nickel and the inner core is made of iron.
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The outer core is hotter than the inner core.
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Detailed explanation-1: -The temperature of the inner core is far above the melting point of iron. However, unlike the outer core, the inner core is not liquid or even molten. The inner core’s intense pressure-the entire rest of the planet and its atmosphere-prevents the iron from melting.
Detailed explanation-2: -The core of the Earth is made up mainly of iron, in an outer liquid layer and an inner solid layer.
Detailed explanation-3: -The metallic nickel–iron outer core is liquid because of the high temperature. However, the intense pressure, which increases towards the inner core, dramatically changes the melting point of the nickel–iron, making it solid.
Detailed explanation-4: -The outer core is not under enough pressure to be solid, so it is liquid even though it has a composition similar to that of the inner core.
Detailed explanation-5: -Earth’s innermost layer is the core, which is separated into a liquid outer core and a solid inner core. The outer core is 2, 300 kilometers (1, 429 miles) thick, while the inner core is 1, 200 kilometers (746 miles) thick.