Final answer:
A low-pressure system of tropical origin occurs when the earth's surface atmospheric pressure is lower than the surrounding environment. This leads to the rising and condensation of moist air, resulting in cloud formation.
Step-by-step explanation:
In terms of weather, a low-pressure system of tropical origin occurs when the earth's surface atmospheric pressure is lower than the surrounding environment. This causes moist air to rise and condense, producing clouds. The movement of moisture and air within various weather fronts instigates most weather events.