Aztecs irrigated and reclaimed swampland so that they could farm.
<u>Explanation</u>:
Aztec refers to people of Central Mexico speaking Nahuatl. The Aztecs were known for introducing irrigation, agriculture and cultivating the land. These people involved in draining swamps and creating artificial islands in the lakes. The artificial island is used for farming.
Aztecs were involved in building pyramids and temples. They learned irrigation to change their habits. Farming became their major occupation. Hieroglyphic writing was introduced by Aztecs. Complex calendar system was implemented and used by Aztecs.
Answer: The Cultural Revolution
Because slavery was a horrible thing in US history and it is important that it doesn't happen again <span />
Answer:
A correlation is only a mathematical means of describing the relationship between variables. When it is a positive correlation, it means when the value of one increases, for example, the value of the other variable also increases or when one decreases, so does the other. A negative correlation would show that as one variable increases in value, the other decreases. These relationships are non-causal as you're not manipulating variables to control them to see what is causing this relationship. Sometimes, non-causal covariance (or variables that don't have an effect on each other vary cooincidentally in a pattern-like fashion, when there is actually another variable causing the relationship going on.
Explanation:
In the case of this example, it is doubtful that having money causes you to have a higher grade point average. So while we see an increase in grade point average with those who have high income it could be due to other factors, like people with more money have access to learning tools, tutors and other things that people with less money don't have access to. So it is access to tools, not money that is actually causing a difference. There are likely dozens if not hundreds of other potential confounded variables that could be causing this observation.
