There are actually 5
Respect the Rights, Beliefs and Opinions of Others
Stay Informed of the Issues That Affect Your Community
Serve in a Jury When Called Upon
Participate in the Democratic Process
Defend the Country, if Need Should Arise
The correct answer is - carving terraced farmlands.
The Incas revolutionized the agriculture in South America by starting to use the carved terraces for production. With this technique, the Incas managed to maximize the arable land area, and to perform farming on places where naturally will be impossible. This method is widely used nowadays, and since the amount of arable land is reducing in the lowlands, it is of great benefit for food production in places that are not suitable for building.
Guangzhou 113°E 23°N
shanghai 121°E 31°N
so the direction is northeast
Due to the densities and saltiness of each water, they won’t mix. Different densities will not mix