Which of the following is the primary source of the thermal energy that heats Earth's atmosphere?

• A. Thermal energy from ocean currents
• B. Heat released by volcanic eruptions
• C. Radiation from the Sun
• D. Energy from Earth's magnetic field

Answer: (C)

Verified step by step guidance

1. Understand that Earth's atmosphere is primarily heated by an external energy source rather than internal processes.
2. Consider the options: thermal energy from ocean currents, heat from volcanic eruptions, radiation from the Sun, and energy from Earth's magnetic field.
3. Recall that ocean currents and volcanic eruptions redistribute or release heat but do not generate the primary heat source for the atmosphere.
4. Recognize that Earth's magnetic field does not produce thermal energy; it mainly protects Earth from solar wind and charged particles.
5. Identify that the Sun emits electromagnetic radiation, which travels through space and heats Earth's atmosphere upon absorption, making solar radiation the primary source of thermal energy.