I think that the beginning of the question says "ill health"
Yes, this is true. low earnings are often correlated with bad health - it's because poor people have less access to health care, less access to healthy food and might be forced to do jobs which are stressful and demanding.
Surface, crust, mantle, and core
The answer is b.
Plants, specifically trees, are the best defense against erosion. The trees planted in the soil prevent the land from eroding due to excess water.
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In poverty for a long time I think
It would be the Civil War
