Sima as a noun is the lower layer of the earth's outer crust that underlies the sial and is rich in silica, iron, and magnesium. while Sial as a noun is the rocks rich in silicon and aluminum that form the upper layer of the earth's crust, which lies beneath all continental landmasses.
Part of speech: noun
Definition: The lower layer of the earth's outer crust that underlies the sial and is rich in silica, iron, and magnesium.
Part of speech: noun
Definition: The rocks rich in silicon and aluminum that form the upper layer of the earth's crust, which lies beneath all continental landmasses.
We hope you now know whether to use Sima or Sial in your sentence.