National Highway 7 connects Kanniyakumari with

Three layers of continental crust from top to bottom are

1. Sedimentary
2. Granite layer
3. Basaltic layer

The mercury's period of revolution round the sun

The equatorial radius of the earth is 

Arrange the atmospheric layer in the ascending order :

1. Stratosphere
2. Troposphere
3. Thermosphere
4. Mesosphere

Galaxy is a