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.
Sand-Away Sanding Disc Driver For Wood Floors. 1  Durable plastic block with the finest quality felt face and a molded plastic holding cup securely holds sandpaper discs. 2  Designed to fit 18 or 19 Inch machines, this 17 Inch Disc Block with a 1 7/16 inch plastic riser uses 18 to 20 inch sanding screens.