The Hadley cell circulation primarily transports (*) heat and this substance away from the equator.
At convergent boundaries, the formation of magma is heavily influenced by this substance, whose presence in rocks changes the linear boundary between solid and liquid on a pressure-temperature diagram to be bowed and allows flux melting. The ratio of this substance to air is depicted on the y-axis of psychrometric charts. Maars are created by explosions due to magma coming into contact with this substance, which is known as a phreatomagmatic eruptions. The Hadley cell circulation primarily transports (*) heat and this substance away from the equator. The expansion, and thus cooling, of an air parcel as it rises causes the condensation of this substance in the atmosphere. This compound is the most abundant greenhouse gas in the atmosphere. For 10 points, name this compound whose presence in air is quantified by humidity.
At convergent boundaries, the formation of magma is heavily influenced by this substance, whose presence in rocks changes the linear boundary between solid and liquid on a pressure-temperature diagram to be bowed and allows flux melting.
water vapor [or steam; or moisture; or obvious equivalents]