The answer is Radon. Radon is an odorless, colorless and tasteless gas. It is the heaviest among the noble gases. It is, in fact, radioactive. Radon is considered to be a health hazard. It is so radioactive that further studies become very difficult. When radon decays, radon progeny is produced. These new substances stick to the surfaces of dust particles in air. When inhaled may stick to the lung and airway walls.
The four spheres of the Earth includes the Geosphere, Hydrosphere, Biosphere and Atmosphere. The sphere that there is interaction in runoff from farming into the local areas is on Hydrosphere. Hydrosphere <span>is the liquid water component of the Earth. It includes the oceans, seas, lakes, ponds, rivers and streams.</span>
To deal with the challenges posed by the midlatitude temperate climate, Europeans have developed a sophisticated system of Drainage system for their houses and communities.
<h3>What is
Drainage system?</h3>
Drainage system serves as the system that allows easy flow of water so as to avoid blockage of water which can lead to serious erosion.
However, Europeans have developed a sophisticated system of Drainage system so as to overcome challenges posed by the midlatitude temperate climate.
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Answer: contour lines.
Topographic maps are easily recognized by their contour lines.
Answer: "oasis" .
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