Why are mountain ranges and polar ice caps not easily classified into a major biome?

According to piaget, children have acquired the cognitive skill of conservation when they're able to a. understand that six ounces of liquid in a jar and six ounces in an elongated tube are equal. b. understand the viewpoint of other people. c. relate objects around them to their own needs. d. realize that the term heavy describes an object one way and the term big describes it another way. it is not b nor c. did this 2 x wrong..

What in scientific term why the salty popcorn causes this thirst

During convection, less dense fluid rises and denser fluid sinks.