The key physical process determining the structures of the giant planets is:
A) fusion.
B) magnetism.
C) pressure.
D) sunlight.

Question

Quizplus · Accepted Answer

The main physical process determining the structures of the giant planets is pressure. The high pressure within these planets leads to the compression of gases and the formation of highly condensed states of matter such as metallic hydrogen in the core of Jupiter and Saturn. This pressure gradient also causes the planet's atmosphere to be divided into distinct layers, each exhibiting different physical characteristics.

Note: A is incorrect because fusion is a process that takes place only in the cores of stars, not in giant planets. B is also incorrect because while magnetism plays a role in the formation of the magnetic fields of the giant planets, it is not the key physical process determining their structure. D is incorrect because the giant planets are located far from the Sun and do not receive a significant amount of sunlight.

The Key Physical Process Determining the Structures of the Giant