Answer:
Population density
Explanation:
However many people are gather into a single area of space is called population density.
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soil erosion in Iran 
The removal of fertile topsoil by the action of wind, rain and river water is called soil erosion. 
Soil erosion is the process of detachment of soil particles from the parent body or disturbance of the soil structure is known as soil erosion. Generally, soil erosion is called as the creeping death of the soil. Soil erosion is considered as negative soil pollution.
Causes of Soil Erosion:
Soil loss is maximum in the region with high population densities. Globally the present rate of soil erosion is over 2500 million tonnes/year. The chief causes of soil erosion are:
1. Land-use changes involving the destruction of forests and grasslands for expansion of agriculture and other commercial activities. 
2. Overgrazing of pastures. 
3. Fallowing of land for a longer duration. 
4. Overuse of chemical fertilizers under intensive cultivation practices destroys the soil structure consequently the soil becomes susceptible to erosive forces. 
5. Shifting cultivation by tribal population. 
6. Continuous cultivation of the same crop.
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The persian gulf because nearly 50% of the worlds oil reserves are found there
        
                    
             
        
        
        
Answer:
Warm, humid climate near the Equator
Explanation:
- For the formation of the coal deposits the presence of the swampy vegetation and the needs a lot of moisture content and a plenty of warm temperatures for them to thrive. These conditions would have been near the today equator.