Change in elevation Distance = Gradient Calculate the gradient (in ft/mile) of the following volcanoes to help you determine their type (shield, stratovolcano or cinder cone). You will have one of each type. A volcano has a change in elevation of 6,400 feet over a distance of 10 miles. Find the gradient: What type of volcano is this? A volcano has a change in elevation of 3,600 feet over a distance of 2 miles. Find the gradient: What type of volcano is this? A volcano has a change in elevation of 640 feet over a distance of 0.2 miles. Find the gradient: What type of volcano is this