Because one might have other minerals in it as well
Answer:
I saw this question on my recent test
B. Both were common governments for early river valley civilizations.
This was my answer and Got it right. Hope This helps you! :0) lol
The burning of fossil fuels like oil, gas or coal. The exhaust fumes from your vehicles. The mismanagement of landfill waste caused by garbage pollution. The harmful fragrance or off-gasing from plastic production, paints and so on
Answer: Big Bend National Park is in southwest Texas
