I will mark brainliest. Why are rivers and oceans both barriers and roadways?

Explain the connections between North and South America.
Compare and contrast the Amazon and Mississippi rivers
Evaluate the effect of physical geography on human culture.
Identify the major geographic and cultural features of Central and South America.

Answer accretion;

Humans have survived and thrived in mexico city by using technology to create greater access to land. when the spanish conquered the aztec capital, tenochtitlan, in the 16th century, they built mexico city by draining the lakes and filling in the lake water to create more arable land for agriculture. this technique of land reclamation has continued to be fundamental to human civilization in mexico city.