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<b>CHÈN AUDIO VÀ VIDEO VÀO FILE PDF </b>

Nếu bạn có sẵn file video (dạng <b>.FLV hoặc .SWF) để minh họa một văn bản tiếng </b>
Anh, bạn có thể chèn file âm thanh đó vào trang <b>PDF. Khi mở trang PDF này, bạn sẽ </b>
xem được video trên trang PDF đó – KHÔNG cần dùng Windows Media Player.

Bạn bấm vào đây để nghe âm thanh văn bản tiếng Anh bên dưới.

Và bấm vào <b>khung hình cuối trang để xem video minh họa về Suối phun Old </b>
<b>Faithful ở Mỹ: </b>

Chỉ nghe và xem được khi mở bằng Adobe Reader 8, 9, hoặc 10.

<b>Foxit Reader hoặc SumatraPDF không nghe và xem được. </b>

<b> Old Faithful</b> is a cone geyser located in Wyoming, in Yellowstone National Park in the
United States. Old Faithful was named in 1870 during the Washburn-Langford-Doane
Expedition and was the first geyser in the park to receive a name. It is also called the
most predictable geographical feature on Earth erupting almost every 91 minutes. The
geyser, as well as the nearby Old Faithful Inn, is part of the Old Faithful Historic
District.

On the afternoon of September 18, 1870, the members of the
Washburn-Langford-Doane Expedition traveled down the Firehole River from the Kepler Cascades and
entered the Upper Geyser Basin. The first geyser they saw was Old Faithful.

Eruptions can shoot 3,700 to 8,400 US gallons (14,000 to 32,000 liters) of boiling
water to a height of 106 to 185 feet (32 to 56 meters) lasting from 1.5 to 5 minutes.
The average height of an eruption is 145 feet (44 meters). The highest recorded

eruption was 185 feet (56 meters). Intervals between eruptions can range from 45 to
125 minutes, averaging 66.5 minutes in 1939, slowly increasing to an average of 90
minutes apart today. The time between eruptions has a bimodal distribution.

More than 137,000 eruptions have been recorded. Harry Woodward first described a
mathematical relationship between the duration and intervals of the eruptions (1938).
Old Faithful is not the tallest or largest geyser in the park; that title belongs to the less
predictable Steamboat Geyser. Its popularity is more likely due to the small eruption
window and high frequency.

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