World Geography
The major events of Pre-Cambrian era include

formation of present day atmosphere
All of these
formation of crust, continents and oceans
formation of crust, birth of oldest known rock, origin of life

ANSWER DOWNLOAD EXAMIANS APP

World Geography
The period of daylight

All of these
varies with latitude and the season
reaches a maximum of 24 hour in the polar zones in summer
is nearly constant near the equator

ANSWER DOWNLOAD EXAMIANS APP