Why are sound waves considered a type of mechanical energy?

Because sound waves can also create energywaves also create energy so it's considered because it can be used in machines

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thrombocytopenia, which is a deficiency in blood platelets, can cause bleeding and bruising in the dermis similar to senile purpura. other possible causes include: exposure to ultraviolet rays and aging skin are common causes of senile purpura. senile purpura may also be a sign of collagen loss in the skin and bones.