Which of the following is an amphoteric compound

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

Will mark brainliest how many electrons can be held in the energy level n = 4?

Select the correct location on the image identify the element that humans need to breathe. 2015 er r ights reserved