Is outgoing a verb, article, noun, or adjective

Which best describes how johannes kepler developed his laws of planetary motion

What are the 4 phases of matter in order of increasing engery content?

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