Name: Wildfires 101 | National Geographic
Uploaded: 2019-08-28T02:01:57.000Z
Duration: 3 min 13 s
Description: Thousands of YouTube videos with English-Chinese subtitles! Now you can learn to understand native speakers, expand your vocabulary, and improve your pronunciation...

While they can start naturally, wildfires are often

caused by humans with devastating consequences.

Wildfires are large, uncontrolled infernos

that burn and quickly spread through wild landscapes.

Types of wildfires may include forest, brush,

and peatland fires, depending on the landscapes affected.

Heat sources, such as the sun, a hot bolt of lightning,

or a smoldering match can supply enough heat

That spark then turns into flames when fuel

but so are living vegetation, called green fuels.

flammable oils that can burn when exposed to a heat source.

As the fuel burns, the resulting flames feed

When air movement or wind occurs, not only is more oxygen

supplied to the fire, but it may also help transport

Since wildfires occur outdoors, they have a nearly

endless supply of oxygen from our atmosphere to burn.

Many wildfires are the result of natural causes.

A warmer climate and weather patterns like El Nino

can create the hot, dry conditions necessary

However, about 90% of wildfires are caused

by human activity, such as campfires that become

uncontrollable, improperly handled cigarettes, or arson.

Although wildfires occur worldwide, they are most common

and frequent lightning and thunderstorms can create

While they can be destructive, and sometimes even deadly

for humans, wildfires do play an important role in nature.

They can help a forest by removing harmful insects

or diseased plants and they can clear thick canopies

to help sunshine reach seedlings on a forest floor.

By being aware of the conditions necessary

for wildfires to occur, they can be managed and prevented,

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Wildfires 101 | National Geographic

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