If ice is asolid how is it possible for it to float in liquid water

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

Determine the reaction and balance the following equations urgent due in the morning

If anyone would be able to me out with these three questions it would be these are from the chem 2202 course.