Which statement discribes a gas?

Iknow the answer to 13 is b and 14 is d. i just need to know why the correct answers are correct

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

Asubstance is a good conductor of electricity which of the following best explains a probable position of the substance in a periodic table