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1. What is the reason for the absence of a delta at the mouth of the Congo River?
The absence of a delta at the mouth of the Congo River is mainly related to three factors: terrain, vegetation, and geological movements. Specifically, the terrain factor is that the area through which the Congo River flows is dominated by mountains and basins, lacking the terrain conditions to form a delta.. The river water flows directly into the Congo Basin after flowing out of the mountains, and most of the sediment it carries is deposited in the basin, resulting in very little sediment ultimately entering the ocean, making it difficult to form significant delta deposits. Vegetation factor: The Congo River basin is covered with the worlds second-largest tropical rainforest (second only to the Amazon rainforest), with dense vegetation and high forest coverage. The lush vegetation effectively solidifies the soil, significantly reducing soil erosion, greatly reducing the amount of sediment carried by rivers, and further weakening the material foundation of delta formation. Geological factors: The crustal movement at the mouth of the Congo River is active and continuously sinking. This regular downward movement causes the sediment carried by the river to sink as soon as it reaches the estuary, making it impossible to accumulate and form a delta at the estuary. On the contrary, long-term subsidence has shaped a trumpet shaped drowned valley landscape, with its open form directly connected to the ocean, presenting a magnificent landscape of waves. In addition, the hydrological characteristics of the Congo River indirectly affect the formation of the delta. As the worlds second largest river (by flow meter), its annual average
2. Principle of current range for multimeters
The principle of current range for multimeters is simply to use a small resistor (professionally called a shunt) to "divert" most of the current, allowing only a small portion of the safe current to flow through the meter head, and then display the true current value through scale conversion.
. Its like measuring the water volume of a large river. Instead of digging the entire river channel, we open a small tributary with an accurate flow meter next to it. By measuring the water volume of the tributary, we can calculate the flow rate of the entire river. 1. Core components: Meter head and shunt resistor. The core of a multimeter for measuring current is its sensitive meter head, which can only withstand very weak currents (usually at the microampere level). If you want to measure a larger current, such as 0.1A or 1A, you must connect a small resistor in parallel at both ends of the meter, which is called a shunt resistor. When current flows into the meter, the vast majority of the current will choose to take the "shortcut" of a smaller shunt resistor. Only a very small amount of current that the meter head can withstand will flow through the meter head itself, thus protecting the meter head from burning out.2. The secret of range switching: Different current levels on the meter (such as 500mA, 50mA, 5mA) correspond to different shunt resistors. When you rotate the knob to select a larger range, the