I think the word you're looking for is <em>convection </em>:)
1 g = 1 cm^3 = 1 m L. Hence, 2000 g = 2000 cm^3 = 2000 mL.
D. The sand has a higher conductivity.
By changing the number of protons in an element, you are fundamentally changing it to a different element.
It’s worth remembering that:
Protons identify the element
Electrons determine properties and behavior of the element
Neutrons contribute to isotopes and just help keep everything stable, by separating the charges. Remember opposites attract. Like charges repel.