Why is the top of the zucchini bread flat?

The top of zucchini bread is typically flat due to the moisture content from the zucchini, which can prevent it from rising significantly. Additionally, the batter's density and the absence of strong leavening agents contribute to a more level surface as it bakes. When the bread cooks, it tends to spread out rather than rise dramatically, resulting in a flat top. Proper mixing and baking techniques can also influence the final shape of the bread.