Reasoning In the USA there are on average 2 million hectares of land cleared by 120,000 wildfires per annum. These uncontrolled blazes can travel at up to 23 kilometres per hour and destroy everything in their path. Prolonged drought and dry conditions produce tinder dry vegetation that can be ignited by a single spark which can rapidly become a raging inferno when fed by hot dry winds. Man starts eighty per cent of all wildfires either intentionally or accidentally.
Embers from campfires and discarded cigarettes are common causes. Nature plays its part too with fires starting via lightning and even the direct heat of the sun. Naturally-occurring wildfires can play an important role in the ecosystem of some forest environments. The fires destroy dead or rotting vegetable matter, returning beneficial nutrients to the ground and killing disease. There are even some seeds that can only germinate if they have been ‘heat-treated’ by such fires.

174. Wildfires can be beneficial to the natural environment

	(a) True
	(b) False
	(c) Cannot say
	(d)

175. One quarter of wildfires are started naturally

	(a) True
	(b) False
	(c) Cannot say
	(d)

176. In the USA a typical month has 10,000 wildfires

	(a) True
	(b) False
	(c) Cannot say
	(d)

TOTAL

Detailed Solution

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