Exam 13: Wildfires

Fire can trigger the release of seeds.

What is the best response if you live in an area threatened by a large wind-driven crown fire?

Were there wildfires before humans? (Choose the best answer.)

If you were a geologist,what evidence might you find (in rocks or sediments)that would indicate that wildfires had occurred in the past?

Imagine that the trees on millions of acres of forest land have been killed for some reason.Describe what you think would be the best approach to decrease the wildfire hazard in this region.

Discuss how climate change might influence the frequency and intensity of wildfire hazards.

Erosion is a common consequence of wildfires.Why?

Lower humidity can result in an increase risk of wildfires.

Which of the following topographic situations is likely most susceptible to wildfire in western Canada?

How does wildfire affect fish and other aquatic species?

A fire in which the tops of most of the trees are burned is called a/an

When plant material burns,carbon dioxide,water vapour,and heat are released.

Why do wildfires on steep slopes often increase in speed upslope as they spread?

Given the same wind velocity,wildfires move faster up slope than they move down slope.

Which of the following is a good reason for a prescribed burn?

Why are south-facing slopes often an ideal place for a wildfire to start?

Lightning strikes cause about 45 percent of the wildfires in Canada but account for about 85 percent of the total area burned.Why?

The boundary between prairie grasslands and boreal forests in Canada is likely to move north as climate warms.

In Canada,the geographic area that is most at risk from forest fires is

In Canada,there typically is no winter wildfire activity.