اکنون در دسترس! پژوهش تلگرام ۲۰۲۵ — مهمترین بینشهای سال 
UPSC GEOGRAPHY
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This channel provides notes from different major books like D.R. khullar, G.C leong etc No copyright material allowed. Queries - @Upscgeographybot
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بر اساس آخرین دادهها در تاریخ 24 ژوئن, 2026، کانال فعالیت پایداری دارد. در ۳۰ روز گذشته تغییر اعضا برابر -1 073 و در ۲۴ ساعت گذشته برابر -53 بوده و همچنان دسترسی گستردهای حفظ شده است.
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“This channel provides notes from different major books like D.R. khullar, G.C leong etc
No copyright material allowed.
Queries - @Upscgeographybot”
به لطف بهروزرسانیهای پرتکرار (آخرین داده در تاریخ 25 ژوئن, 2026)، کانال همواره بهروز و دارای دسترسی بالاست. تحلیلها نشان میدهد مخاطبان بهطور فعال با محتوا تعامل دارند و آن را به نقطه اثرگذاری مهم در دسته آموزش تبدیل کردهاند.
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Repost from UPSC GEOGRAPHY
■ CLASSIFICATION OF COAL.
2. LIGNITE (Brown coal)
◇ Contains 40 to 55 per cent carbon.
◇ Moisture content is high (over 35 per cent).
◇ It undergoes spontaneous combustion (this is undesirable because it creates fire accidents in mines).
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67 144
■ CLASSIFICATION OF COAL.
2. LIGNITE (Brown coal)
◇ Contains 40 to 55 per cent carbon.
◇ Moisture content is high (over 35 per cent).
◇ It undergoes spontaneous combustion (this is undesirable because it creates fire accidents in mines).
67 144
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■ CLASSIFICATION OF COAL.
1. PEAT
◇ Contains less than 40 to 55 per cent carbon (has more impurities).
◇ Contains sufficient volatile matter and lots of moisture (gives out a lot of smoke when burnt cause pollution).
◇ Left to itself, it burns like wood, gives less heat, emits more smoke and leaves a lot of ash.
67 144
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■ STAGES OF COAL FORMATION.
#Economicgeography
◇ In the process of transformation (coalification),
1. Buried plants turn into peat,
2. Peat is altered to lignite,
3. lignite is altered to sub-bituminous,
4. sub-bituminous coal is altered to bituminous coal, and
5. bituminous coal is altered to anthracite (oldest, best quality coal).
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■ FORMATION OF COAL.
#Economicgeography
◇ Most of the world’s coal was formed in Carboniferous age (350 million years ago.)
◇ Name Carboniferous refers to coal-bearing strata.
◇ Coal formed millions of years ago when the earth was covered with huge swampy (marshy) forests.
◇ As plants grew, some died and fell into the swamp waters.
◇ New plants grew up to take their places and when these died more grew.
◇ In time, there was thick layer of dead plants rotting in the swamp.
◇ Surface of the earth changed, and water and dirt washed in, stopping the decaying process.
◇ More plants grew up, but they too died and fell, forming separate layers.
◇ After millions of years many layers had formed, one on top of the other.
◇ Weight of the top layers and the water and dirt packed down the lower layers of plant matter.
◇ Heat and pressure produced chemical and physical changes in the plant layers which forced out oxygen and left rich carbon deposits. In time, material that had been plants became coal.
