What can happen when two plates boarding each other suddenly move and release energy? a) earth's crusts shakes. b) lava erupts. c) a trench is formed. d) mountains are created.

One does not belong why? ice, gold ,wood ,diamond and table salt

Consider hydrogen in an excited state n = 5n=5 that emits photons to reach the ground state. there are various possible transitions other than straight to the ground state that can occur; for example, it can drop to the n = 3n=3 state followed by the n = 3n=3 to the ground state transition. which of the possible transitions will result in the emission of a photon in the visible region?

Exit what is the density of an object having a mass of 5.0 g and a volume of 45.0 cm3?