<span>C) Using inexhaustible solar energy to mine minerals
</span>second law of thermodynamics deals with energy:
<span>the branch of physical science that deals with the relations between heat and other forms of energy (such as mechanical, electrical, or chemical energy), and, by extension, of the relationships between all forms of energy.</span>
The dependent clause of a sentence is a part of a sentence before or after a comma that can't stand alone. the dependent clauses are: " After he was injured by a stray ball," and "Though he hated Math,"
The US is unlikely to suffer from labor shortage because of the large immigration quotas that the country has and that are necessary. Thanks to the diversity in the country and the constant income of young people willing to work, there will be no labor force shortage.