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.
A sand island is an island that is largely or completely made of sand. The largest sand island in the world is Fraser Island. Other examples of large sand islands are Moreton and North Stradbroke Islands which lie south of Fraser Island off the east coast of Australia..http://en.wikipedia.org/wiki/Sand_island. See it here in Living Color! sand island is an island that is largely or completely made of sand. The largest sand island in the world is Fraser Island. Other examples of large sand islands are Moreton and North Stradbroke Islands which lie south of Fraser Island off the east coast of Australia.. http://en.wikipedia.org/wiki/Sand_island.