Water used for paper mills should not contain
A). magnesium
B). sodium
C). iron
D). chlorine
iron
Water used for paper mills should not contain iron.
1. The change of state of ice into water vapour is known as:
2. Which one of the following cycle is not a gaseous biogeochemical cycle in ecosystem?
3. This holds a planet's atmosphere close to its surface:
4. The study of minerals is called
5. Who coined the slogan of Chipko Movement "Ecology is Permanent economy".
8. Green revolution is associated with _________
9. Environmental education should be in _______ approach.
10. Plants that grow in saline water-logged habitat are called