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A geyser is the result of underground water under the combined conditions of high temperatures and increased pressure beneath the surface of the earth. Since temperature rises approximately 1°F for every sixty feet under the earth’s surface, and pressure increases with depth, the water that seeps down in crack and fissures until it reaches very hot rock in the earth interior becomes heated to temperature in excess of 290 °F. Because of the greater pressure, the water shoots out of the surface in the form f steam and hot water. The result is a geyser. In order to function, then a geyser must have a source of heat, reservoir where water can be stored until the temperature rises to an unstable point, an opening through which the hot water and steam can escape, and underground channels for resupplying water after an eruption.

Favorable conditions for geyser exist in some regions of the world including New Zealand, Iceland, and the Yellowstone National Park area of the United States. The most famous geyser in the world is Old Faithfull in Yellow Park. Old Faithfull erupts almost every hour, rising to a height of 125 to 1790 feet and expelling more than ten thousand gallons during each eruption.

 

How geyser is produced?

  1. By the rise of temperature pressure functioning hot steam

  2. From a huge tension of heated water that coming out from the earth crack

  3. From the heated temperature in earth crack that absorbing water

  4. From the temperature and absorbed water that occurs on earth surface

  5. By the hot water and temperature of hot rock that occurs on earth surface

Y. Yuli.Widya

Master Teacher

Jawaban terverifikasi

Pembahasan

Berdasarkan kalimat “A geyser is the result of underground water under the combined conditions of high temperatures and increased pressure beneath the surface of the earth” yang terdapat pada kalimat pertama di paragraf pertama, dapat diketahui bahwa geyser tercipta akibat semburan air bawah tanah yang dipengaruhi suhu yang tinggi dan meningkatnya tekanan uap yang berada di bawah permukaan bumi sehingga pilihan jawaban (A) adalah yang paling tepat karena maksud dari kalimat tersebut adalah geyser tercipta akibat peningkatan suhu dan tekanan yang memfungsikan uap panas (dan kemudian uap itulah yang mendorong air di bawah permukaan bumi menjadi tersembur ke luar bumi sebagai aliran geyser). Pilihan jawaban (B) salah karena hanya membahas tekanan air panas yang keluar dari kerak bumi, padahal yang menerobos keluar dari kerak bumi adalah air bawah tanah, (C) dan (D) salah karena tidak ada pembahasan terkait penyerapan air (water absorb), dan (E) salah karena dikatakan bahwa geyser tercipta beneath Earth’s surface (di bawah permukaan) bukan on the surface (di atas permukaan).

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