Geography Questions

Definition of a dammed lake.

Dammed (sè) lake.

A dammed lake is a lake formed by blocking a river valley or riverbed after blocking a river valley or riverbed due to volcanic lava flows, or landslides caused by ** activities and other reasons. Lakes formed by the interception of volcanic karst flows are also known as lava dam lakes.

It must be emphasized that the blockages of dammed lakes are not fixed and unchanging, they are also subject to erosion, erosion, dissolution, collapse, and so on. Once the blockage is broken, the lake overflows and pours down, creating a dangerous flood.

Once a dammed lake becomes a threat, it must be diverted or dredged by manual excavation, blasting, interception, etc., so that it can flow into the main stream basin or disperse to the reservoir to avoid flooding.

The process of formation of a dammed lake.

1. The original water system.

2. The original water system is blocked by blockages. The blockage may be a volcanic lava flow, a landslide caused by ** activity and other reasons, a debris flow, or other materials.

3. After the river valley and riverbed are blocked, the flowing water gathers and overflows in all directions.

4. When the water is stored to a certain extent, a dammed lake will be formed.

Low clouds are mostly composed of water droplets, while thick or vertically vigorous low clouds are composed of water droplets, supercooled water droplets, and a mixture of ice crystals. The cloud base height is generally below 2500 meters, but it varies with the season, weather conditions and different geographical latitudes. Most low clouds are likely to produce precipitation, with continuous precipitation in Nimbostratus and cumulonimbus in showers, sometimes very heavy.

I haven't learned about this before.

Elect Ant Hunger D. The legend shows the Sichuan Basin, with abundant precipitation and a developed water system, the result of which is inevitably fertile soil (for example, the Chengdu Plain is synonymous with wealth and fertile fields); Because the Sichuan Basin is a fairly closed (topographical) basin, and at the same time, it is the topography of China.

First, the transition area of the second tier, the terrain is complex, the climate is changeable, and the lead returns to excess fog, and the result is a lack of light (Chongqing fog is proof); As for whether it is commercial grain agriculture or monsoon paddy field agriculture, it is obvious that China basically does not have the conditions for commercial grain agriculture (the per capita cultivated land area is large, the terrain is easy to mechanize farming, the population is small, and the agricultural technology and farming technology are advanced).

It is located in the monsoon region of China (see the map of Lingshenliang in China) and is located in the southern region, so it is a monsoon paddy field agriculture. Then, using the elimination method, the map shows that there are many rivers, so there is no problem of insufficient water sources, the width of the foot is located in the south, and the light should be sufficient. And it is surrounded by mountains, so you can only choose poor soil, so choose blind posture A

Through the interpretation of latitude and longitude Qi, it can be concluded that this area is located in the Sichuan Basin of China, which belongs to the Gaodan scattered rice planting industry, and the light is insufficient due to the many rainy days.

The answer is wrong.