Pitch and Frequency are basically the same thing, but frequency can be quantified more easily. (Quantified is assigning a value). A piano may play a pitch of C, but the freque â¦ ncy could be 512 hertz. C is the pitch.
What is a dead zone? Hypoxic zones are areas in the ocean of such low oxygen concentration that animal life suffocates and dies, and as a result are sometimes called dead zones.. One of the largest dead zones forms in the Gulf of Mexico every spring. Each spring as farmers fertilize their lands preparing for crop season, rain washes fertilizer off the land and into streams and rivers.
So when billions of gallons pours down Texas rivers and into the Gulf, it smothers the salt water beneath, blocking it from the oxygen in the air above. Then a dead zone--also called hypoxia--begins to form, and it stays in place until late summer storms bring waves to mix the water.