Lava flows, bodies of lava that erupt from a volcano and run down its side, pose a threat to local communities because they can destroy what lies in their path. Mt. Etna is one of the most active volcanoes in the world, producing many lava flows each year, which makes it a good candidate for studying how lava moves. Rocks were taken from different parts of a lava flow on Mt. Etna that was deposited during February and March of 2025. Lab analyses performed on each of these samples shows how the lava changed in chemical composition and texture as the lava flowed down the side of Mt. Etna. This data was used to make a model of the viscosity, the resistance of a material to flow, of the lava flow. The viscosity of a lava flow determines how it will move. This model could be used to assess the risk of other lava flows on Mt. Etna while they are erupting.