From the chart that is contained in this question the country that is considered as the least developed are countries 1 and 5.
The reason for this answer is the fact that both of these countries have the lowest income per capita in US dollars.
Apart from this fact, country 1 and 5 also are among the countries with the highest infant mortality per 1000.
Life expectancy is also the lowest in both countries while urban population is lowest there too.
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Taiwan is the East Asian country that is currently threatened by the expansion of its desert in its western region.
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Answer:
mechanical weathering
Explanation:
As a definition, mechanical weathering is the disintegration and decomposition of rocks on or on the earth's surface produced by different atmospheric, climatic and biological agents.
Weathering is a permanent process in nature.
It is also defined as a static process by which the rock breaks into small fragments, dissolving and decomposing to form new minerals. This is the way in which the removal and transport of detritus then results in erosion. It follows that weathering, by reducing the consistency of the stone masses leads to the erosion process.
The causative agents of the weathering of the stones, (external geological agents) can be physical (mechanical), chemical and biological.