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Zorluk: OrtaIdentifying Core Claims and Hypotheses

### Lunar Crustal Asymmetry

The Moon's near side (facing Earth) is characterized by a thin crust and vast, dark volcanic plains (maria), whereas the far side is dominated by a thick, heavily cratered crust with almost no maria. Two hypotheses attempt to explain this asymmetry.

Hypothesis 1
Shortly after the giant impact that formed the Moon, Earth had two companion moons: the current Moon and a second, smaller moon (about one-third the Moon's diameter) that formed from the same debris disk. Due to gravitational forces, the smaller moon was eventually pulled into a slow-speed collision with the far side of the Moon. Because the collision velocity was lower than the speed of sound in rock, the smaller moon did not form a crater. Instead, it pancaked and accreted a thick layer of companion-moon material onto the far side, creating the thick crust. The near side remained unaffected by this accretion, leaving its thinner crust vulnerable to subsequent volcanic eruptions that formed the maria.

Hypothesis 2
Immediately after formation, the Moon was tidally locked to Earth, meaning the same side (the near side) always faced Earth. At this time, both bodies were extremely hot. Earth, being much larger, cooled far more slowly than the Moon, remaining at temperatures above 2,500 K2,500\text{ K} for millions of years. This molten Earth radiated intense heat directly onto the Moon's near side. The far side of the Moon, facing away from the hot Earth, cooled rapidly, allowing silicate minerals to condense and form a thick crust. On the near side, the intense radiative heat from Earth prevented similar crustal condensation, resulting in a much thinner crust.

According to Hypothesis 2, which of the following processes was primarily responsible for the thinner crust on the near side of the Moon?

  1. The radiation of intense heat from the early Earth, which prevented mineral condensation on the side facing Earth.Cevap
  2. B
    A low-velocity collision with a smaller companion moon that deposited extra material onto the far side.
  3. C
    Frequent volcanic eruptions on the near side that melted away the pre-existing thick crust.
  4. D
    The rapid cooling of the Earth, which drew heat away from the far side of the Moon.

Cevap

The radiation of intense heat from the early Earth, which prevented mineral condensation on the side facing Earth.
Hypothesis 2 states that the early Earth remained hot and radiated heat directly onto the Moon's near side. This prevented silicate minerals from condensing, resulting in a thinner crust on that side compared to the far side, which cooled rapidly in the absence of Earth's radiation.

Adım Adım Çözüm

1
Locate the discussion of the near-side crust in Hypothesis 2.
Hypothesis 2 explains that the Moon was tidally locked, so the near side always faced the Earth.
This establishes the physical orientation of the Moon relative to the heat source.
2
Identify the cause of the thin crust on the near side as described by Hypothesis 2.
The early Earth remained at temperatures above 2,500 K2,500\text{ K} and radiated intense heat onto the Moon's near side, preventing silicate minerals from condensing.
This identifies the physical mechanism responsible for the crustal thickness difference.
3
Match this explanation to the correct option.
The option stating that radiative heat from the early Earth prevented mineral condensation on the side facing Earth is selected.
This option matches the identified mechanism exactly.

Anahtar Kavram

Identifying the core mechanism or claim of a specific hypothesis in a scientific debate.
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Identifying Core Claims and Hypotheses

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