What is always included in a comparative investigation

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

Is laundry detergent an acid or a base?

Astudent reacts 13 moles of iron with 21 moles of oxygen according to the following equation: