Source: http://www.schooltube.com/video/9057485211684b0a9275/Weekend%20Lesson:%20Surface%20Area%20and%20Volume%20of%20Spheres
This video explains what a sphere is, and how to find surface area and volume
Source: http://www.schooltube.com/video/358dba9c69d54f999e88/Surface%20Area%20and%20Volumes%20of%20Spheres%201
This is a continuation of the previous video.
Source: http://www.schooltube.com/video/d71233ee0a2e4336b26e/Surface%20Area%20and%20Volumes%20of%20Spheres%202