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As one learns from the passage, the reason why a wildfire is followed by vegetation growth is that ----.
Wildfires are an important environmental hazard in
many geographical areas. Those areas most prone to
wildfires have wet seasons followed by dry seasons.
Vegetation that grows and accumulates during the
wet season dries out enough during the dry season
to burn easily. When lightning hits the ground, it
ignites the dry organic material, and a fire spreads
through the area. Actually fires have several effects
on the environment. First, burning frees the minerals
that are locked in organic matter. The ashes
remaining after a fire are rich in potassium,
phosphorus, calcium, and other minerals essential for
plant growth. Thus, vegetation flourishes following a
fire. Second, fire removes plant cover and exposes
the soil, which stimulates the germination of seeds
requiring bare soil, and encourages the growth of
shade-intolerant plants. Third, fire can cause
increased soil erosion because it removes plant
cover, leaving the soil more vulnerable to wind and
water.
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the minerals in the soil, especially potassium, phosphorus, and calcium, are preserved perfectly |
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soil erosion takes a long time and, therefore, plants have time to grow up |
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plant seeds in the soil are unaffected by the fire and begin to germinate in the wet season |
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the ashes of the burnt organic matter contain many minerals indispensable for plants |
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the area where the fires have taken place becomes suitable for shade-intolerant plants |