Calf Muscles. 1  The calf muscles are six in number: the gastrocnemius, the soleus, the popliteus, the tibialis posterior, the flexor digitorum longus, and the flexor hallucis longus. 2  The gastrocnemius and the soleus run between the knee and the ankle. 3  One of the calf muscles, the soleus, has a special ability.
Ozone Pollution. Ground level or bad ozone is not emitted directly into the air, but is created by chemical reactions between oxides of nitrogen (NOx) and volatile organic compounds (VOC) in the presence of sunlight.
Ozone depletion and its causes. Ozone depletion is the term commonly used to describe the thinning of the ozone layer in the stratosphere. Ozone. depletion occurs when the natural balance between the production and destruction of ozone in the stratosphere is. tipped in favour of destruction. Human activity is the major factor in tipping that natural balance, mostly from. releasing artificial chemicals, known as ozoneâdepleting substances (ODS), to the atmosphere.