The minerals are sorted into two groups. Which property are they sorted by?

A.
color

B.
hardness

C.
luster

D.
shape

In 2002, the rare earth elements mine in mountain pass, california was closed because

Which liquid (h2o, h2o + soap, or h2o + salt) has the strongest cohesion and adhesion? (need now plz)

Which best describes the activation energy of a chemical reaction? a. the combined energy of all the reactants b. the amount of energy required for a reaction to occur c. the difference in energy between products and reactants d. the potential energy stored in the bonds of reactants and products