Tooth fillings are often made of gold or porcelain because those materials are not what?

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 formula that this ionic compounds could form sr2+p3-o2-

Electrons are extremely important to what area of technology? a) anti-aging research b) household product development c) electronics d) drug discovery