Because one might have other minerals in it as well
The advantage of using passive or active solar systems was these systems release low amounts of carbon dioxide or other pollutants. Thus, Option C is the correct statement.
<h3>What is the benefit of using Passive or active solar systems?</h3>
One of the best reasons to use effective solar technology is to reduce your energy bills. Active solar systems can include expensive hardware, and Passive solar systems may create the cost of renovating your home, but a reduction in your utility bills will ultimately outweigh the costs.
Thus, Option C is the correct statement.
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At the center of the Earth is the core, which has two parts. The solid, inner core of iron has a radius of about 760 miles (about 1,220 km), according to NASA. It is surrounded by a liquid, outer core composed of a nickel-iron alloy. The outer core is about 1,355 miles (2,180 km) thick.
