World Geography
The major events of Pre-Cambrian era include

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

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World Geography
Which among the following statements is/are correct about Fronts?The boundary zone when two different type of air masses meet is called a Front.Differences in terms of tem­perature, humidity, precipitation, cloudiness, and wind direction are experienced along different fronts.Occluded front is formed when cold front over­takes warm front and warm air is completely displaced from the ground surfaceSelect the correct code from the options given below:

None of these
Only 1
1, 2 & 3
Only 1 & 2

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