1.1. An object in the space between Earth and the Sun has an average temperature of 3 K.

(i) State how the intensity of radiation the object receives from the Sun at this point differs from the intensity at the Earth's surface. 

[1]

(ii) Explain why the temperature of the object in space here is lower than if it was on Earth.

[2]

1.2. The Earth's magnetic field arises from its iron-rich molten core, shown in Fig. 1.2.

Molten iron must be in motion to generate a magnetic field. 

The inner core is very hot and solid. The outer core is also iron-rich and liquid.

Explain the origin of the Earth's magnetic field, referring to density in your answer.