### Answer

The correct choice regarding the cause of Earth's magnetic field is:

**d. 外核で，発電作用と電磁石効果が起きている。**

### Explanation

- The Earth's magnetic field is primarily generated by the movement of molten iron and other metals in the outer core, where convection currents contribute to the geodynamo effect, which creates magnetic fields.
- Choices a, b, c, and e are inaccurate because the solid mantle and inner core do not generate the magnetic field to the degree that the outer core does.

Question

### Answer

The correct choice regarding the cause of Earth's magnetic field is:

**d. 外核で，発電作用と電磁石効果が起きている。**

### Explanation

- The Earth's magnetic field is primarily generated by the movement of molten iron and other metals in the outer core, where convection currents contribute to the geodynamo effect, which creates magnetic fields.
- Choices a, b, c, and e are inaccurate because the solid mantle and inner core do not generate the magnetic field to the degree that the outer core does.

Knowee AI · Accepted Answer

### Answer

The correct choice regarding the cause of Earth's magnetic field is:

**d. 外核で，発電作用と電磁石効果が起きている。**

### Explanation

- The Earth's magnetic field is primarily generated by the movement of molten iron and other metals in the outer core, where convection currents contribute to the geodynamo effect, which creates magnetic fields.
- Choices a, b, c, and e are inaccurate because the solid mantle and inner core do not generate the magnetic field to the degree that the outer core does.

Question

地磁気の発生原因に関して，適切な記述．（１）1つ選択してください:

Solution

Answer

Explanation

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