What causes the different time zones?

The need for continental time zones stemmed directly from the problems of moving passengers and freight over the thousands of miles of rail line that covered North America by the 1880s. Since human beings had first begun keeping track of time, they set their clocks to the local movement of the sun.

preservation because he preserves part of the land and preserves means save

explanation:

oceans

indian ocean

pacific ocean

atlantic ocean

arctic ocean

southern ocean