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.
Some of the major causes of pollution are littering, smoke from factories and trucks, things that could be recycled but aren't, etc.ut common pollution is caused by fumes emitted for factories, cars, burning of fossil fuels; throwing waste on roads, beaches; releasing harmful chemicals into the water bodies, etc. It is caused by people, animals and natural events. Industries or too much smoke in the air or the environment being a mess or disaster.