â¢ One plate is pushed beneath the other, or equivalent description. â¢ A trench may be formed at the subduction zone. (ii) Explain how subduction leads to volcanic activity. (2 points: 1 point for a correct explanation of one plate being pushed down and melted and 1. point for a correct explanation of molten material /magma rising to the surface near the zone)
Symptoms of atrial fibrillation occur when the upper chambers of the heart (atria) beat in a disorganized fashion. Atrial fibrillation is a type of arrhythmia. Characteristic symptoms include shortness of breath, palpitations, and lightheadedness.
Symptoms of AFib. The symptoms of AFib may feel similar to those of a heart attack: 1  Heart palpitations. 2  Chest discomfort or pressure. 3  Chest pain. 4  Lightheadedness. 5  Abdominal pain. 6  Shortness of breath.7  Fatigue. 8  Lack of energy.hen a person experiences a heart attack, they are likely to feel: 1  Chest discomfort or pressure. 2  Chest pain. 3  Shortness of breath. 4  Confusion. 5  Extreme fatigue. 6  Dizziness. 7  Sweating. 8  Nausea. 9  Pain that travels down the arm(s). 10  Pain that goes into the jaw, back, or stomach.