Final answer:
Steep roofs have less snow and debris accumulation due to their angle, which provides less surface area for collection and allows gravity to more effectively remove such materials.
Step-by-step explanation:
Less snow and other debris accumulate on a steep roof compared to a flatter roof because the steeper angle reduces the amount of surface area where snow and debris can collect. Additionally, gravity has a greater effect on items on a steep slope, leading to faster removal of the snow and debris as they slide off more readily. In contrast, flatter roofs provide a larger, more stable surface for accumulation and less gravitational assistance to clear the debris naturally.