The average time a substance remains in the ocean (or any specific part of the hydrologic cycle) is called its

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. 

When the indian plate collided with eurasian plate because it was cool 

The earths position determine its atmosphere, water cycle and climate all of which are very important factors that contribute to life.