Transit efficiency, energy usage, and average income
C is the correct anwser because it proves how we are very dependent on chemicals.
Answer:
A. They are extremely difficult to extinguish because fuel obviously is abundant and oxygen can enter easily, even through joints in surrounding rock.
Explanation:
Coal bed fires refers to spontaneous combustion which are triggered by human activity (mining), lightning, wildfires etc.
This usually happen underground when the coal beds are exposed to oxygen as a result of mining activities or human induced fires or combustion.
<span>Removing ground water in Mexico City is a problem because it causes A. land to sink.</span>
Answer:
Sunspots appear over a range of 40-50∘N latitude to 40-50∘S latitude.
