The spread of new ideas, products, and practices.

Trade route between the Romans and Chinese.

When products are exchanged between different places.

When war, persecution and the absence of political rights cause people to migrate.

When natural disasters or climate change cause people to migrate.

When discrimination, intolerance, or a lack of religious freedom cause people to migrate.

When changes in the availability of resources, in trade patterns or employment opportunities cause people to migrate.

When people have cleared the land and built large settlements, known as cities.

Consequences, or effects, are not what was planned or expected.

Power created from modifying moving water, such as rivers and lakes.

Average temperatures and rainfall; there are seasonal variations.

Shelter, food, clothing, transportation, and recreation.

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