How did Indus River Valley civilizations use irrigation techniques? Please answer I need this for a big test

What are the cultural characteristics of mexico?

According to the aztec history, how did the aztecs know where to build their new city of tenochtitlan? why was this a good location?

When non-english-speaking children are initially taught in their native language, while at the same time learning english, this is called bilingualism bilingual education pragmatics metalinguistics?