If you have choices, it would be really helpful if you'd include them with your question, but I'd say
More than half of the forests in the Czech Republic have been destroyed by pollution.
Answer: Hydroelectricity.
Explanation:
A mountain peak on a topographic map a mountain would be represented by parallel contours of elevation according to the shape of the peak and the overall shape would be coming to a point or the peak of the mountain and since it is a mountain the contours would be fairly close together.
