Consider the following: 1. Electromagnetic radiation 2. Geothermal energy 3. Gravitational force 4. Plate movements 5. Rotation of the earth 6. Revolution of the earth Which of the above are responsible for bringing dynamic changes in the surface of the earth?

All six are correct. The question asks about dynamic changes, meaning processes that keep reshaping the surface, not just the earth's internal structure.

• 1. Electromagnetic radiation (solar energy): drives weathering, the hydrological cycle, and the temperature and pressure differences that power winds, erosion and deposition.
• 2. Geothermal energy: internal heat drives mantle convection, volcanism and hot springs, which build and alter the surface.
• 3. Gravitational force: drives mass wasting such as landslides and soil creep, river flow and glacier movement.
• 4. Plate movements: create mountains, earthquakes, rift valleys and ocean basins.
• 5. Rotation of the earth: produces the Coriolis effect, which deflects winds and ocean currents and shapes cyclones and circulation patterns.
• 6. Revolution of the earth: together with axial tilt, causes seasons and latitudinal differences in insolation that drive climate-linked surface processes.

Core concept: endogenic and exogenic forces together shape the earth's surface. This links to the geomorphology part of the GS-I syllabus and to Mains questions on landforms, climate and disaster risk.

Trap: aspirants dismiss rotation and revolution as irrelevant because they are not visible processes, and then pick option B or C. Both operate through climate and circulation.