Final answer:
The drought in Syria that drove farmers to relocate for work is described as an environmental and economic push factor, which shows the interlinkage between environmental events and economic conditions.
Step-by-step explanation:
In the context of Syria between 2006 and 2009, the drought that led to thousands of farmers moving in search of work is primarily classified as an environmental and economic push factor. As the drought, being an environmental condition, led to a failure in agricultural production, it created economic hardship for the farmers who depended on their crops for livelihood. This illustrates how environmental disasters can significantly affect the economy, pushing people to migrate in search of better economic opportunities and conditions.