The sun (solar radiation) because the sun heats the Earth unevenly Earth's surface generates pressure differences. Wind is the result of horizontal differences in air pressure.
While doing exercise, one can control skeletal muscles only.
The body has three kinds of muscles, that is, skeletal muscle, cardiac muscle, and smooth muscle. The skeletal muscles are linked with the bones of the skeleton, that is why these are under control and are known as voluntary muscles.
On the other hand, the smooth muscles like skeletal muscle can never be under control. These muscles helps in pushing substances, like blood or food through organs. The cardiac muscle is also an involuntary muscle, which is found only in the heart. These muscles helps in contraction of the heart and can never be controlled.
The Cenozoic era is the most recent era which still lasts. It is the era about which the scientist have by far the most knowledge. The reason why this era is much better studied and known by the scientists is exactly that it is the most recent one. The fossils are there in abundance as they did not had enough time to totally dissolve. The rock layers formed in this period are largely kept, and very little of them have been destroyed. The continents have moved of course, but it is easily traceable and in much lesser extent when compared with longer periods of time. The events that happened in this era are much recent, so their leftovers are abundant, as well as easier to study and find. All of this have resulted in much larger database, and significantly greater knowledge about this era than any other before it.
Wetlands are natural filters for rivers and streams, as well as overflow areas. The removal of them causes rivers and streams to be less healthy and can cause increased flooding.
