A. collapsing dust clouds
<span>The harvesting of rice is an economic activity that is most
common in Eastern Asia. The climatic condition of Eastern Asia is most suited
for the cultivation of rice. Many families are dependent on the cultivation and
harvesting of rice for making their livelihood.
The cultivation of rice is the principal activity for them. The cultivation of rice requires good amount
of rainfall. The climatic condition of this region helps in good production of
quality rice. The rice is often exported to make foreign currency. </span>
Answer:
<u>Radon </u>in door source of air pollution.
Explanation:
- From all Pollutant and sources found in the interior of the homes like the pet dander and molds, pesticides and asbestos. Radon a chemical element found in homes having an atomic number of 86. It is a radioactive and odorless tasteless natural gas.
- Through the radon is non-reactive elements, it can be oxidized with compounds of fluoride. It has no stable isotopes characterized bt unstable mass. In the mining industry, it caused due to the exposure from the released air.
- Radium-226 is used to produce the radon which is found in uranium ores and phosphate rocks. An estimate of about 2.4 billion curies of radon is released every year into the soil. This pollutant can also be found in water bodies and even in construction sites.
