What type of physical change is it when a liquid turns into a solid and a solid turns into a liquid

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

What is the common name for the compound shown here? enter the common name of the compound shown?

The independent variable in an experiment will be the variable that you o a) change ob) hold constant ng c) observe for changes