I think the correct answer from the choices listed above is option C. The average salt content of seawater as measured in parts per thousand (ppt) would be 35 ppt. <span>The salinity of </span>seawater<span> is usually 35 </span>parts per thousand<span> in most marine areas. Hope this answers the question.</span>
It's an elastic wave in the earth produced by an earthquake or other means. hope it helps!
