Air is then breathed into the windpipe and lungs, while the mucus is swallowed (figure 3). Other. Other interesting structures associated with the nasal and sinus tract: Tear duct (called the nasolacrimal duct): drains tears from the inside corner of the eye into the nasal cavity (figure 1).
Human activity is the main cause of soil degradation. Agriculture plays a large part in soil degradation, especially clearing, irrigation, the spreading of chemical fertilizer â¦ s and pesticides, overgrazing and even the passage of heavy farming equipment. Tillage and the clearing and deforestation of large plots of land also lead to soil degradation.
Earth's Surface Processes. After seeing some of the slower processes that shape Earth's landscape over time, it is important to remember that some may be much faster process. Events such as landslides, volcanoes, tsunamis and earthquakes can change a landscape in the blink of an eye.hile these slope failures can happen due to natural causes such as torrential rain or earthquakes, they can also be caused by human activity such as machinery blasting that weakens the ground. 1  In the right-center of the picture to the left we see an example of slope failure leading to a landslide in India.