Neolithic Revolution as irrigation and deforestation which allowed the production of surplus food. Other developments found very widely are the domestication of animals, pottery, polished stone tools, and rectangular houses. These developments, sometimes called the Neolithic package, provided the basis for centralized administrations and political structures, hierarchical ideologies, depersonalized systems of knowledge (e.g. writing), densely populated settlements, specialization and division of labour, more trade, the development of non-portable art and architecture, and property ownership. The earliest known civilization developed in Sumer in southern Mesopotamia (); its emergence also heralded the beginning of the Bronze Age. The relationship of the above-mentioned Neolithic characteristics
Pre-Pottery Neolithic Neolithic B (PPNB 7600 BCE - 6000 BCE). These were originally defined by Kathleen Kenyon in the type site of Jericho (Palestine). The Pre-Pottery Neolithic precedes the ceramic Neolithic (Yarmukian). At 'Ain Ghazal in Jordan the culture continued a few more centuries as the so-called Pre-Pottery Neolithic C culture. Around 8000 BCE during the Pre-Pottery Neolithic A (PPNA) the world's first town Jericho appeared in the Levant. PPNB differed from PPNA in showing greater use of domesticated animals, a different set of tools, and new architectural styles. Work at the site of 'Ain Ghazal in Jordan has indicated a later