What is a greenhouse gas?(1 point)
Responses
a gas that forms a physical barrier to block escaping heat
a gas that forms a physical barrier to block escaping heat
a gas at higher temperature than the surrounding atmosphere
a gas at higher temperature than the surrounding atmosphere
any gas in the troposphere that absorbs and re-emits infrared radiation
any gas in the troposphere that absorbs and re-emits infrared radiation
any gas in Earth's atmosphere