What indicates a river valley on a topographic map and how do you know the direction the river is flowing?
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A blue line indicates that there is water running through the valley. If there is not a blue line the V pattern indicates which way water flows.

clinically, some people often have repeated allergies, eczema and respiratory infections or other parts of the infection, in this case, in addition to some routine tests such as tests for white blood cells, immunoglobulin series, lymphocyte subsets, etc., the five immune immunoglobulin tests are also necessary.

1. a tropical dry forest carries out more rapid nutrient cycling