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.
During the warm summer months, when there is little mixing in the water column, the bottom water can stagnate and become hypoxic, or low in oxygen. If the hypoxia becomes severe enough, you have a dead zone. The size of the Gulf of Mexico dead zone varies from year to year. In 2012, the dead zone covered less area than usual, which may have been due to drought conditions in the Midwestâlow rainfall means less runoff from land. This year the dead zone is slightly larger than average.