Tropical rain forests once covered more than 14 per cent of the land of the Earth, and now cover no…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
Tropical rain forests once covered more than per cent of the land of the Earth, and now cover no more than per cent. Take the land area of the Earth as million square kilometres.
- How much area did the rain forests once cover, in million square kilometres? Give one decimal.
- How much do they cover now?
- How much has been lost, and what per cent of the old cover is that?
Need a reminder? The key ideaShow
The evil quartet: habitat loss and fragmentation, over-exploitation, alien species invasions, co-extinctions. A piece of forest has an edge, which has the conditions of the open land, and a core. For a square piece of side with an edge of width , the core is a square of side (not in the NEET syllabus).
The worked solution
Have you tried it?
Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Given. Land million . Cover per cent once, per cent now.
Step 1. (a) million .
Step 2. (b) million .
Step 3. (c) million lost. per cent of the old cover.
Answer: ; ; million ; per cent.
Check. A fall from to per cent of the land is a loss of more than half of the forest.
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