Animated graphics compare the Earth to a peach with a hard core, soft mantle and outer crust. When the hot liquid mantle pushes through the crust, it can form a volcano, out of which lava may flow.
After watching the clip, children could have their own peach to cut into 2 pieces. In groups, children could label what they see and present to each other using their peach as a demonstrating tool to show their learning. This could be done at the end of a topic on volcanoes as an assessment tool. The topic could also be brought to a climax by enabling children to erupt their own volcanoes using vinegar and bicarbonate of soda mixed together (and perhaps a dash of washing up liquid and red food colouring for the extra wow factor).