1. manganese is a strategic mineral. in other words,
a. nations that want manganese must import it
b. world demand for manganese is greater than world supply
c. supplies of this mineral are unknown in quantity and location
d. manganese is a crucial element in weapons manufacturing

2. which of the following energy sources is most available at the edges of tectonic plates?
a. natural gas
b. geothermal
c. winds
d. tides

Astable electron arrangement for an atom is one that does not easily change. how is this arrangement arrived at? a. valence electrons are transferred or shared to create a full outer shell of electrons. b. valence electrons are discarded into space to create a full outer shell of electrons. c. protons (positive charge) pair with valence electrons (negative charge) to create a strong bond. d. outer shells with valence electrons are transferred or shared.