Which type of wave would actually slow down when moving from the air into the ocean

What is the smallest component or the most basic building block of any element ? a. an atom, b.a compound c.gas d.element

What is the mass of 4 molecules of co2

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