Where Are Most Volcanoes Found ?

Can someone me with these questions plz.

Arollercoaster car at the top of a hill has potential energy kinetic energy chemical energy light energy

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