Read the map of Hunan Province in China and answer the following questions. Material 1: Hunan is a big agricultural province, known as the "land of abundance" and "Huguang".

(1) From Figure A, we can see the distribution of mountains, so we can draw a conclusion that it is surrounded by mountains in the west, east and south, and the Dongting Lake Plain in the northeast, with the terrain high in the west and low in the east, high in the south and low in the north.

(2) As can be seen from Figure B, the area of Dongting Lake from July to September is smaller than that in June; The area of the lake area has become smaller in terms of precipitation, evaporation and river inflow. July-September is controlled by subtropical high, and the precipitation is greatly reduced compared with June. At this time, the summer temperature is high and evaporation is strong; The precipitation in the main and tributary basins is reduced, and the amount of water flowing into the lake area is small.

(3) The advantageous geographical conditions for Changsha to become an "international rice capital" are: a big agricultural province, a "land of fish and rice" and a "land of fish and rice in developed lakes". The rice planting area and output rank first in China, and it has a yield advantage. Hybrid rice R&D and production bases have produced 6% of the national grain science and technology advantages with 3% of the national cultivated land, and there are 16544 rice processing enterprises in the province.

(4) "Zhangjiajie landform" refers to the seasonal sandstone peak forest landform in Wulingyuan. This is the only place in the world that can be found. Steep rock peaks, vast forests, beautiful mountain streams, deep caves and valleys ... "Three thousand peaks and eight hundred waters" converge into a magical and wonderful world. The obvious karst landform is the peak forest landscape, so sandstone is deposited first, then lifted into mountains, and then eroded into peak forests by flowing water.

(5) As can be seen from Figure A, the region is rich in nonferrous metal mineral resources; There are many rivers flowing into Dongting Lake from mountainous areas, and there are abundant hydropower resources. Therefore, it is suitable for developing nonferrous metal smelting industry.

So the answer is: (1) surrounded by mountains in the west, east and south, Dongting Lake Plain in the northeast, high in the west and low in the east, high in the south and low in the north.

(2) small; Decreased precipitation; High temperature and large evaporation; The main water flow into the lake and the tributary water flow are very small.

(3) Advantages of planting location (warm and humid climate, flat terrain and abundant water resources); Yield advantage (planting area and output rank first in China); Scientific and technological advantages (the birthplace of hybrid rice, 3% of cultivated land produces 6% of grain); Advantages of industrial development.

(4) sedimentation-crustal movement (rising)-flowing water erosion; Scientific value, aesthetic value and ecological value.

(5) Abundant nonferrous metal mineral resources; Abundant water resources; ? Non-ferrous metal smelting industry; Reasons: Non-ferrous metal smelting industry is a power-led industry (non-ferrous metal smelting industry needs to consume a lot of energy); Acid rain.