CBSE Class 9 Answered

1. The image shows Black Blizzards. These are terrifying dust storms, very often 7,000 to 8,000 feet high, rising like monstrous waves of muddy water. They began to blow over southern parts of America in the 1930s.

2. This took place in Western Kansas on 14th April 1935.

3. The reason for its occurrence was the expansion of wheat agriculture. In the early 19th century, farmers in an attempt to expand cultivation and earn huge profits began the clearing of lands. They uprooted all vegetation, and used tractors to plow the land. As the land was devoid of all vegetation cover, ordinary dust storms became black blizzards. Consequently, the whole region tuned into a dust bowl.