In the photoelectric effect, what happens when light hits the metal

Metallic bonds are good conductors of electricity true or false

What layer of the atmosphere is directly above the troposphere?

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