UNIVERSE
PLANETARY INTERIORS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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The Earth exhibits a magnetic field that reaches above our atmosphere. For a magnetic field to exist, either a permanent magnet must be in the Earth’s interior, or ionized molecules are moving in a liquid medium in the Earth’s interior. A permanent magnet cannot exist in the Earth’s interior due to the high temperatures deep in the Earth. The presence of Earth’s magnetic field tells scientists that
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the magnetic field is produced by ionized iron moving about in the Earth’s liquid outer core.
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) the inner core must be made of a mixture of metals that can melt at high temperatures and release electrons.
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the elements within Earth’s inner and outer core must be hot enough to turn to plasma and ionize.
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the mass of Earth’s core is much greater than the other layers of Earth.
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Explanation:
Detailed explanation-1: -Density calculations show that Earth’s core is metal. Seismic waves show that the inner core is solid and the outer core is liquid. Metallic meteorites and the magnetic field are also clues about the makeup of the core.
Detailed explanation-2: -The primary contributors to heat in the core are the decay of radioactive elements, leftover heat from planetary formation, and heat released as the liquid outer core solidifies near its boundary with the inner core.
There is 1 question to complete.