helped humans to discover ancient oceans

prevented migration because of a colder climate

humans would choose to migrate to very cold areas because they were coming from warm climates

exposed land bridges that helped people travel to other continents

people settled where there were enough resources

people usually travelled to cold areas

people moved to escape natural disasters

people migrated until they found areas that were suitable to their needs

people stayed far away from coastlines and settled near rivers

South America

North America

Australia

continent was hard to reach from Africa

humans ran out of space on other continents

helped humans communicate

used to meet the basic needs of people

helped humans explore

helped farmers grow different crops

allowed people to establish permanent settlements

allowed people to travel further from their homes

decreased the need for trade between civilizations

eliminated need for farming

reduced dependence on government

increases hunter-gatherer activities

allowed some people to do something other than farming

dwellings built on the side of a small mountain

dwellings sunk into soil due to seasonal flooding

dwellings could be reached by walking on rooftops

new dwellings were built on top of old dwellings

climate

dependence on hunting

creation of art

large size

complex agriculture

trade

raise animals

harvest timber

hold religious rituals