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.
Most fibroids do not cause any symptoms, but some women with fibroids can have: 1  Heavy bleeding (which can be heavy enough to cause anemia) or painful periods. 2  Feeling of fullness in the pelvic area (lower stomach area). 3  Enlargement of the lower abdomen. 4  Frequent urination.