There are two basic types of wave motion for mechanical waves: longitudinal waves and transverse waves. The animations below demonstrate both types of wave and illustrate the difference between the motion of the wave and the motion of the particles in the medium through which the wave is travelling.
Updated:Sep 16,2015. Heart disease is the No. 1 killer for all Americans, and stroke is also a leading cause of death. As frightening as those statistics are the risks of getting those diseases are even higher for African-Americans. The good news is, African-Americans can improve their odds of preventing and beating these diseases by understanding the risks and taking simple steps to address them.
1 For every 6 white Americans who have diabetes, 10 African Americans have the disease. 2  Among African Americans 20 years and older, the prevalence of diabetes is 8.2 percent compared with 4.8 percent among non-Latino whites.ype 1 diabetes accounts for 5 to 10 percent of all cases among African Americans, while type 2 diabetes accounts for 90 to 95 percent of all cases. In every age group the prevalence of diabetes is higher among African-American women than among African-American men.