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Which alternative energy source is the most efficient with an earned return on investment (EROI) ratio of more than 80:1?

Theories are accepted explanations for how the world works and are supported by evidence.

In the figure, how many Kcal will the mouse get from the grasshopper?   

In the figure, how many Kcal will the mouse get from the grasshopper?   

As glaciers and ice sheets melt, increased runoff into the oceans causes

We can enhance our quality of life by prioritizing friends, family, leisure time, and memorable experiences over material consumption.

Reclamation is to restore the site to a condition similar to its condition before mining.

We can enhance our quality of life by prioritizing friends, family, leisure time, and memorable experiences over material consumption.

______________ is a type of surface mining where the overlying vegetation, rock, and soil is removed in order to reach the underlying resource.

As a society, fossil fuel use does not increase medical expenses and environmental cleanup costs.