Why is there a temperature difference between La and NY​

Salt in oceans comes from and of rocks

Consider a culture medium on which only gram-positive organisms such as staphylococcus aureus colonies can grow due to an elevated nacl level. a yellow halo surrounds the growth, indicating the bacterium fermented a sugar in the medium, decreasing the ph as a result and changing the color of a ph indicator chemical. this type of medium would be referred to as a differential and enrichment culture.

Ajar contains a certain substance. which observation would show that the substance must be either a solid or a liquid?