A drop in pressure is an indication of

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A drop in pressure is often associated with an approaching cold front, which is a region where colder, denser air replaces warmer, less dense air. This is because the movement of the cold air causes the pressure to drop as it encounters the warmer, less dense air ahead of it. Orographic lifting (B) refers to the lifting of air over a mountain range, which can cause cooling and precipitation, but does not necessarily result in a drop in pressure. Adiabatic expansion (C) occurs when air rises and expands due to a decrease in pressure, which can also cause cooling and cloud formation, but is not directly related to a drop in pressure. A stationary front (D) is a boundary between two air masses that is not moving, but can still lead to changes in weather patterns such as cloudiness and precipitation. However, it does not necessarily result in a drop in pressure either.

A Drop in Pressure Is an Indication of