How can martin show what causes day and night using his model answer that?

Martin can demonstrate the causes of day and night using a simple model of the Earth and the Sun. By having a globe represent the Earth and a lamp as the Sun, he can show how the Earth's rotation on its axis leads to varying exposure to sunlight. As the globe spins, different parts of its surface move into and out of the light, creating the cycle of day and night. This visual representation effectively illustrates how the Earth's rotation causes these daily changes.