Questions

Rights guaranteed by law, is the best description of Civil liberties.

Civil liberties are also called as personal freedoms. They are personal guarantees and freedoms that the government cannot abridge, either by law or by judicial interpretation, without due process.

 Main Boot Record is located in sector 0, track 0, head 0, cylinder 0 of the primary active partition.

A greenhouse gas is a gas in an atmosphere that absorbs and emits radiant energy within the thermal infrared range. This process is the fundamental cause of the greenhouse effect. 

Carbon dioxide is a main greenhouse gas, found in car exhaust pipes.
Methane and nitrous oxide is another type of greenhouse gas.

Oxygen is the only clean gas out there because we need it to survive. Therefore, the only gas that is not a greenhouse gas is Oxygen.