Need to finish this quiz in the next 15 minutes. Giving away many points

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

Which of these conditions most likely produces an unstable isotope?

What’s the theoretical yield of solid lead