Explain what silt is and why is it important. :  Silt/Silty soil is usually more fertile than other types of soil, its also very  meaningful because it is good for growing crops. Silt promotes water retention and air circulation. Too much clay can make soil too stiff for plants to thrive. 

Describe what a civilization is. :    A civilization is a complex human society, usually made up of different cities, with certain characteristics of cultural and technological development. In many parts of the world, early civilizations formed when people began coming together in urban settlements.    What led to the population growth and formation of villages? :  Reasons for the expected population growth include increase in the number of young unmarried mothers, high fertility rates for some ethnic groups, and inadequate sexual education and birth control provision.   List the features of a civilization? :