Harriet Tubman: Conductor on the Underground Railroad is an interesting and well-written book that tells the story of an extraordinarily courageous and committed woman. Tubman continues to inspire those seeking dignity for all people in America. Petry's dramatization of Tubman's perseverance and sense of purpose in leading slaves to freedom shows how a motivated individual can bring about change.
Petry intends for Harriet Tubman to fill a void in an important part of United States history and asserts that "the majority of textbooks used in high schools do not give an adequate or accurate picture of the history of slavery in the United States." A completely adequate and accurate account of slavery would no doubt require many volumes, yet this biographical novel represents significant movement toward that ideal. It juxtaposes well-known historical information with details about Tubman's "underground" activities. This technique adds depth and relevance to the story of Tubman's achievements.
 
        
             
        
        
        
if you could list them with some separation or order i could help you out
 
        
                    
             
        
        
        
Dear sir,
I am writing to you to inform you about the dangers that pollution of water bodies can cause in the environment.
Polluting water bodies is bad for the aquatic animals and for human beings. Pollution of the water can lead to the death of aquatic animals like the fishes, crabs etc.
Furthermore, pollution can lead to several health conditions such as diarrhea, cholera, cough etc. It's important to keep the environment clean and water bodies safe. Pollution can also lead to cancer which can then lead to death.
In conclusion, I'll be grateful if the issue of pollution is addressed and the environment becomes better for everyone.
Yours faithfully, 
John. 
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Gravity causes water to infiltrate until it reaches impermeable zones where it is diverted laterally. Gravity generates the flow of springs, rivers, and wells. If the pores in rocks and sediments are connected, gravity allows the water to move slowly through them.