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.
Now, in CONTRAST.... Sand dollars are members of a specialized sub-group of sea urchins that are often referred to as the Irregular Urchins. These urchins differ quite a bit from the so-called Regular urchins because they show a suite of adaptations to living in sandy/muddy/ bottoms! In irregular sea urchins..ow, in CONTRAST.... Sand dollars are members of a specialized sub-group of sea urchins that are often referred to as the Irregular Urchins. These urchins differ quite a bit from the so-called Regular urchins because they show a suite of adaptations to living in sandy/muddy/ bottoms! In irregular sea urchins..