Growing crops on mountainous terrain can make farming very difficult. This kind of problem is what started the idea of terraced gardens where parts of the mountain were flattened out kind of like steps in order to increase surface area and make it easier to farm.
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Altruism is the principle and moral practice of concern for happiness of other human beings or other animals, resulting in a quality of life both material and spiritual.
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the return trip was upstream => against the flow of the river.
They developed a collection of city states and as trade increased, cities situated near or on good harbours became large and powerful because they served as centres for trade. also to show the right of others
