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.
1) Central Highlands and Rift Valley. Most of Kenyaâs agricultural output â especially tea â is grown in this region, which has fertile soils and a high annual rainfall in the mountains (up to 3,000mm).This rain feeds into the lakes of the Rift Valley. Average daytime temperatures in Nairobi (altitude 1,661m) are between 21-26Â°C.ost of Kenyaâs agricultural output â especially tea â is grown in this region, which has fertile soils and a high annual rainfall in the mountains (up to 3,000mm). This rain feeds into the lakes of the Rift Valley.