what crops were discovered that could replenish the nutrients of the soil
Crop rotation A great advantage of crop rotation comes from the interrelationship of nitrogen fixing-crops with nitrogen demanding crops. Legumes, like alfalfa and clover, collect available nitrogen from the soil in nodules on their root structure.[7] When the plant is harvested, the biomass of uncollected roots breaks down, making the stored nitrogen available to future crops. Legumes are also a valued green manure: a crop that collects nutrients and fixes them at soil depths accessible to future crops.[8]
Nandalal Bose He was given the work of illustrating the constitution of India
Neolithic Revolution The traditional view is that agricultural food production supported a denser population, which in turn supported larger sedentary communities, the accumulation of goods and tools, and specialization in diverse forms of new labor. The development of larger societies led to the development of different means of decision making and to governmental organization. Food surpluses made possible the development of a social elite who were not otherwise engaged in agriculture, industry or commerce, but dominated their communities by other means and monopolized decision-making.[60] Jared Diamond (in The World Until Yesterday) identifies the availability of milk and/or cereal grains as permitting mothers to raise both an older (e.g. 3 or 4 year old) child and a younger child concurrently, whereas this was not possible previously. The result is that a population can significantly more-rapidly increase its size than would otherwise be the case, resources permitting.
Base oil The least refined type which produced by Solvent Refining. It usually consists of conventional petroleum base oils.