Which statement is true about flood risk in the united states?
floods happen every few years and are usually only mild.
floods happen every year, but they are usually only damaging once a decade or so.
floods are common but not as frequent as other natural disasters, like tornadoes and earthquakes.
floods are the country's number one natural disaster and happen throughout the country every year.

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.