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While this type of mining has less environmental impacts, it can cause aquifer contamination due to accidental leakage of acids.

›Meeting the needs of the present without compromising the ability of future generations to meet their own needs is called

If you want to know the daily temperature for the next five days, you are looking up the [answer1]. When you look up the average temperature of north Florida from 1990 to 2000, this is the [answer2].

Human activities have not caused an imbalance in the nitrogen, phosphorus, and carbon cycles. 

Hydrogen fuel cells are not an energy efficient source because less than 25% of the energy generated in the reaction can be used.

This fossil fuel is unrefined oil extracted from the ground.

This figure is illustrating what process?   

Why is Tutankhamen so well know because:

Why is Tutankhamen so well know because:

Thirteenth and fourteenth century Italian art had its roots in both byzantine form and Italian artists contact with roman and early Christian precedents