Examining the images month-by-month, there appears to be a connection between the amount of vegetation at a location and the amount of UV (ultraviolet radiation) exposure the same location receives. UV exposure is one way to measure the amount of light, or solar radiation, reaching Earth's surface.
Using the question "Is the amount of light closely related to the changes in the vegetation?" as an example, you might develop the following working hypothesis:
- "As plants need light for photosynthesis, the amount of green vegetation should be directly related to the amount of light that an area receives."