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.
What is the primary cause for the thinning of the ozone layer? the breakdown of ozone molecules due to a chemical reaction with free chlorine in the atmosphere What are the main risks of indoor air pollution in developing countries? Biomass and coal are burned in open pit fires without the right fuel to air ratio, which causes incomplete combustion.