[Natural Disaster] (10) On March10, a sandstorm swept through North China. The picture shows the weather chart of sandstorm and its occurrence and attenuation.

(1) Frontal cyclone (front, cold front) (2 points)

(2) The sand dunes (2 points) are close to the sand source; The climate is dry and windy; When the wind is weakened or blocked, the strong wind carrying sand and dust will produce wind accumulation and form a aeolian landform. (6 points)

(1) In this weather system, cold and warm air masses meet and the airflow moves counterclockwise, so it is a frontal cyclone.

(2) There is no graph on the right in the question.

The dust sinks in the third place to form sand dunes, which are deposited by wind. The formation of sand dunes is related to the local climate, such as drought, windy weather and nearby sand sources.