It is known that the atmosphere is divided into some layers. In which one among the following layers, is the percentage composition of Helium gas maximum?

Esker is a geomorphic feature developed by

Which of the following are the results of EI Nino?

1. Reduction in the amount of planktons which further reduces the number of fish in the sea.
2. Irregularities in the evaporation of sea water.
3. Distortion of equatorial atmospheric circulation.

Select the correct answer using the code given below

Statement I :
I. Zinc is used for galvanization to protect iron from rusting.
Statement II :
II. Zinc is more reactive towards oxygen than iron.

Statement I :
I. Very little hydrogen is produced when sulphuric acid is added to calcium.
Statement II :
II. The salt that is produced, calcium sulphate, is insoluble.

Statement I :
I. Limestone decomposes when it is heated in air.
Statement II :
II. Increase in the content of CO2 in the atmosphere in recent years is mainly due to the using of limestone in the manufacture of cement.