Question

1. what is the primary external energy source for earths systems? geothermal energy lunar influence solar radiation tectonic movement

Explanation:

To determine the primary external energy source for Earth's systems, we analyze each option:

• Geothermal energy: It is internal energy from Earth's core, not external.
• Lunar influence: It affects tides but is not the primary external energy source for most Earth systems.
• Solar radiation: The Sun provides energy that drives processes like weather, photosynthesis, and ocean currents, making it the primary external energy source.
• Tectonic movement: It is driven by internal geothermal energy, not an external source.

Answer:

C. Solar radiation