Carbon dioxide (C02), nitrous oxide (N20) and methane (CH4) are green house gases, responsible for global warming.
CTET Solved Paper MCQ - UPTET December 2016
Indus, Narmada and Tapti fall into the Arabian sea whereas Subarnrekha falls into the Bay of Bengal.
U-shaped valleys or glacial troughs are formed by the process of glaciation. Glaciated valleys are formed when a glacier travels across and down a slope curving the valley by the action of scouring.
The best remedial measure could be to find out the reasons for being irregular and untimely in submitting his assignment and counsel him accordingly.

