Which of the following statements regarding insolation is/are correct? 1. Insolation is predominantly short-wave radiation, with wavelengths in the range of 0.39 micrometre to 0.76 micrometre. 2. Insolation is evenly distributed across the Earth because of the Earth's curved surface.

Statement 1 is correct: solar insolation reaching the Earth is predominantly short-wave radiation, the visible portion lying roughly between 0.39 and 0.76 micrometres. Statement 2 is incorrect — the curved (spherical) shape of the Earth is precisely the reason insolation is UNEVENLY distributed, with equatorial regions receiving more concentrated solar energy and polar regions receiving slant, diffused rays. Hence only statement 1 is correct.