Copperas Cove Junior High students study density, mass and volume Fri, 10/09/2020 - 12:00am Copperas Cove Junior High student Serena Streeto slowly dipped a piece of cardstock into a mixture of water, vegetable oil ...PLEASE LOG IN FOR PREMIUM CONTENT. Our website requires visitors to log in to view the best local news. Not yet a subscriber? Subscribe today! Read more about Copperas Cove Junior High students study density, mass and volume