Use of science to invent useful things or to solve problems

Designing and constructing buildings

A frame made with wooden poles covered with bark, and then covered with mud

A group of countries or regions controlled by one ruler

A protective wall made of sharpened sticks

Method for planting crops in a hilly region by building flat levels into hills

Type of farming where trees are cut down and burned and then new crops are planted in their place

Advanced state of human society in which a high level of social structure, government, religion, technology, and writing systems has been reached

Large area of high, flat land