I know that in Sumer ... by Trevor https://padlet.com/trevmat1/da9udic9xj2o en-us 2018-08-01 04:43:22 UTC 2018-08-01 04:57:35 UTC hello@padlet.com the environment was very important. For example, the two major rivers were vital to the survival of every community for water supply, but were also a threat to the communities in time of flood or drought. trevmat1 https://padlet.com/trevmat1/da9udic9xj2o/wish/271636480 2018-08-01 04:56:00 UTC https://padlet.com/trevmat1/da9udic9xj2o/wish/271636480