Natural Bridge ? Karst topography

Yardang ? Arid topography

Cliff ? Costal topography

Tafoni ? Landform ? Volcanic topography

Silk appear first

Both of these appear at same time

Tassels appear first

None of these

Miri Hills - Arunachal Pradesh

Mikir Hills - Assam

Lushai Hills - Mizoram

Abor hills - Tripura

constant change of refractive index of the medium between the stars and the Earth because of temperature variation

frequent and periodic fluctuation of temperature of the surface

great distance of stars from the Earth

rise and fall of gaseous ball of fire inside the stars

Both A and R are individually true and R is the correct explanation of A

Both A and R are individually true but R is not the correct explanation of A

A is true but R is false

A is false but R is true