It is buoyant when hot because these minerals melt easily to form basalt which can then rise through the upper layers as magma.
(It; is; buoyant; because these minerals melt easily to form basalt) (these minerals; melt easily; to form basalt) (these minerals; to form; when hot because these minerals melt easily to form basalt which can then rise through the upper layers as magma) (basalt; can rise; T:then)
It these minerals these minerals basalt
is melt easily to form can rise
buoyant because these minerals melt easily to form basalt
to form basalt
when hot because these minerals melt easily to form basalt which can then rise through the upper layers as magma
T:then