Please help me & actually answer instead of the links lol thank youu :)

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

Which set of characteristics best describes igneous rock? a) largest type of rock, made of organic matter, hardest type of rock b) least abundant type of rock, made of other rocks, made mostly of minerals c) found on all continents, contains wavy bands of stripes, contains fossils d) most abundant type in earth's crust, made of magma/lava, contains no fossils

How can one make a supersaturated solution? (apex)