S1. Alien dust carried and deposited on the glacier surfaces by winds absorb more solar radiation owing to their darker colour. P. Beyond this, the mineral dust also forms the basis of nutrition in the ecosystem. Q. This drops to 20 per cent when the surface is deposited with this alien dust. R. Ice and snow cover on glaciers typically reflect about 60 per cent of solar radiation. S. The higher absorption of solar radiation results in the melting of water around the dust and the formation of the circular or ovular pockets. S6. This can support a host of invertebrate life, and mircrobes are at the top of the foodchain, which is seldom seen outside glaciers.

S1. Alien dust carried and deposited on the glacier surfaces by winds

1.	S1. Alien dust carried and deposited on the glacier surfaces by winds absorb more solar radiation owing to their darker colour. P. Beyond this, the mineral dust also forms the basis of nutrition in the ecosystem. Q. This drops to 20 per cent when the surface is deposited with this alien dust. R. Ice and snow cover on glaciers typically reflect about 60 per cent of solar radiation. S. The higher absorption of solar radiation results in the melting of water around the dust and the formation of the circular or ovular pockets. S6. This can support a host of invertebrate life, and mircrobes are at the top of the foodchain, which is seldom seen outside glaciers.
A.	PQSR
B.	SPQR
C.	SRPQ
D.	RQSP
Answer» E.