HELPPP which one has four energy levels Si, Ge, or Sn???

Your friend offers to show you an intrusive igneous rock. which of the following would you expect to see?

This large tectonic plate is bounded on three sides by whats know as the ring of fire. what is the name of this tectonic plate? a) pacific plate b) eurasian plate c) north american plate d) indo- australian plate plz it's science but there's no option for science so i picked chemistry

What is the standard unit of measure for acceleration?