(a) What are the destructions caused by cyclones? (b) What happens when high speed winds blow over the roofs of the buildings that are weak?

Cyclones are large-scale revolving storms that result from low pressure systems in the atmosphere. They produce strong winds and heavy rainfall, causing damage to the environment, infrastructure, and human life. The destruction caused by cyclones can vary depending on their strength, location, and the preparedness of the affected area.

(a) Cyclones cause extensive destruction in the areas they affect, which often includes the following: 1. Strong winds: The powerful winds associated with cyclones can cause damage to structures, uproot trees, and overturn vehicles. 2. Heavy rainfall: Cyclones are often accompanied by torrential rain, which can lead to flooding, landslides, and other damage to the environment. This also disrupts transportation and communication systems. 3. Storm surges: A storm surge occurs when the sea level near the coast rises significantly due to low pressure systems associated with cyclones. These surges can cause widespread coastal flooding and erosion. 4. Damage to infrastructure: Cyclones can cause extensive damage to power lines, communication systems, transportation networks, and other critical infrastructure components. 5. Destruction of crops and livestock: The strong winds and heavy rains caused by cyclones can severely impact agriculture, resulting in the loss of crops and livestock. 6. Loss of life and property: The combination of destructive forces caused by cyclones can lead to significant loss of human life, as well as damage to homes, businesses, and other property.

(b) When high-speed winds blow over the roofs of buildings that are weak, the following consequences may occur: 1. Roof uplift: The high-speed winds can create a lifting force on the roof which, if it exceeds the roof's capacity to withstand, it may cause the roof to be completely blown off or partially damaged. 2. Wall deformation: The lateral force of the wind on the walls of weak buildings can cause deformation and, in some cases, ultimately lead to the collapse of the walls. 3. Window and door damage: High-speed winds can break windows and doors, causing further damage inside the building. 4. Falling debris: The force of the wind can cause loose materials or damaged parts of the building to be detached and carried away, which can cause harm to people or property in the vicinity. 5. Structural collapse: In extreme cases, the combined effect of wind forces on a weak building may result in the complete collapse of the structure, posing a significant danger to anyone inside or nearby. These consequences emphasize the importance of constructing buildings that can withstand the effects of high-speed winds, especially in areas prone to cyclones.