Describe the process of nuclear fission as illustrated in a simple diagram. What are the key components involved in this process?

Nuclear fission involves the splitting of a large unstable nucleus, such as uranium or plutonium, into two smaller nuclei. This process is initiated when a neutron is absorbed by the nucleus, leading to its instability and subsequent division, releasing energy and additional neutrons.

This question tests the student's understanding of nuclear fission and their ability to interpret diagrams related to the process. It requires knowledge of the components involved, such as the large nucleus and the neutron, which are crucial for understanding fission.