Threats to our Forests

For an ecosystem to be classified as a forest, more than ____ of the land must be covered by trees

• 10 percent

• 20 percent

• 50 percent

• 90 percent

What percent of terrestrial animals depend on forest habitats?

• 60

• 70

• 80

• 85

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Tropical forests can impact the weather.

• True

• False

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What is the annual rainfall or precipitation per year in Boreal Forests?

• 12-20 inches

• 30 - 60 inches

• 60 - 100 inches

• 100+ inches

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What are deciduous trees?

• Trees with pine cones

• Trees that have a short lifespan

• Trees that drop their leaves for the winter

• Trees that bear fruit

Which forest provides for 40% of the worlds oxygen?

• Boreal Forest

• Taiga Forest

• Temperate Forests

• Tropical Rainforests

Most of the impact on forests has been caused by the conversion of forests to which of the following?

• Grocery stores

• Housing development

• Agricultural land

• Retail stores

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By 1900, the percentage of forest in the United States was which of the following?

• 25

• 33

• 47

• 60

The introduction of ______________ has caused an increase in endangered plant and animal species.

• Venus fly traps

• Invasive species

• Wild fires

• Soil erosion

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Why is fire important to the health of forests? (choose all that apply)

• can rejuvenate growth by releasing seeds

• helps trees grow taller by removing unwanted bank

• clearing dead vegetation from the forest floor

• Fire is not important - it destroys the forests

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