Four volcanoes are introduced through brief pieces of informational text: Mt. Vesuvius, Mt. St. Helen’s, Krakatau and Mt. Pelee. Students answer a few questions based on the reading. A map is provided for a better understanding of the location of each volcano. To reinforce the concept of ratio, students are asked to convert the elevation and base from one unit of measure to another. A ratio table is provided. To reinforce the concept of geometry (specifically the area of a triangle) students are asked to draw each volcano as a triangle and calculate its area in both miles and feet, or feet and meters. Calculators are suggested.