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.
Reservoir where the water can be stored will be .. after eruption and resupplying again.
Berdasarkan kalimat “...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” yang terdapat pada kalimat terakhir di paragraf pertama, dapat diketahui bahwa reservoir adalah sebuah bagian permukaan yang terbuk untuk menyimpan air hingga suhu meningkat secara tidak stabil agar air dan uap panas dapat menyembut ke luar saat erupsi sehingga pilihan jawaban (C) adalah yang paling tepat karena reservoir harus dalam keadaan terbuka krena berfungsi sebagai jalur atau ‘channels´untuk menyuplai kembali air setelah semburan.
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