What is relative humidity and what two factors can change it, science homework help

Define each of the processes listed below that cause water to change phases: a.)evaporation b.)condensation c.)melting d.)freezing e.)sublimation f.)deposition
What is relative humidity and what two factors can change it.
List and briefly define four mechanisms/processes that cause air to rise.
Define each of the following cloud types: a.)cumulus b.)stratus c.)cirrus d.)nimbus e.)alto f.)cumulonimbus
What is the “Dew Point”?