Using a globe and a source of light, teacher can demonstrate the following…

Concept

A globe is a scaled model of the Earth, and a single source of light acts as the Sun. Together they can model only those phenomena that arise from the Earth's own motion and its geometric relationship with sunlight: how the Earth spins, how only the half facing the light is lit, and how the tilt of its axis changes the angle and spread of sunlight through the year.

Applying it to each concept

• Rotation: spinning the globe on its axis in front of the fixed light directly models the Earth turning about its own axis - demonstrable.

• Day - Night: at any instant the light falls on only one half of the globe; the lit half is day and the shadowed half is night, and spinning the globe shows the cycle - demonstrable.

• Seasonal Variations: keeping the axis tilted (about 23.5 degrees) and moving the globe around the light shows how each hemisphere alternately leans toward or away from the light, changing the directness of the rays - demonstrable.

Why rainfall is different

Distribution of Rainfall depends on the atmosphere - moisture-bearing winds, ocean currents, mountains that force air to rise, and pressure belts. None of these exist on a bare globe-and-light setup, so rainfall distribution cannot be demonstrated by this apparatus.

Result

Only Rotation, Day - Night and Seasonal Variations can be shown, so the correct combination is A, B and C.