Final answer:
Different types of lava, with varying viscosity and composition, result in different appearances of lava flows.
Step-by-step explanation:
Not all lava flows look the same because there are different types of lava with varying viscosity and composition. The viscosity of lava determines how easily it flows, while the composition affects its color, texture, and other properties.
For example, basaltic lava flows more fluidly and can cover long distances, resulting in smoother surfaces, while more viscous lava like andesitic or rhyolitic flows tend to form thicker, blocky structures. Additionally, the presence of gases in the lava can create vesicles and other distinctive features.