Lesson Objectives. 1  List the main features of the seafloor: mid-ocean ridges, deep sea trenches, and abyssal plains. 2  Describe what seafloor magnetism tells scientists about the seafloor. 3  Describe the process of seafloor spreading.
Assignment Help. The average diameter of sand dollars on a certain island is 4.50 centimeters with a standard deviation of 1.00 centimeters. If 9 sand dollars are chosen at random for a collection, find the probability that the average diameter of those sand dollars is more than 4.13 centimeters.he average diameter of sand dollars on a certain island is 4.50 centimeters with a standard deviation of 1.00 centimeters.
Diving for Dollars. Shells and sand dollars are plentiful on a barrier island at the mouth of Tampa Bay called Egmont Key. This uninhabited island is home to Fort Dade, a long-abandoned Spanish-American War fortress.eashells and sand dollars regularly wash up on beaches with the tides. At times, beaches on both of Floridaâs coasts will be covered with shells, although some beaches have different shells from others.