Question

ഭൂഗർഭജലത്തിന്റെ മണ്ണൊലിപ്പിന്റെ ഫലമായി രൂപപ്പെട്ട ഭൂപ്രകൃതി ഏതാണ് ?

1. പോൾജെ
2. ഡോളിൻ  
3. ഹ്യൂമസ് 
4. ഡ്രപ്സ്

• A. i and ii only
• B. i, ii and iii only
• C. i, ii and iv only
• D. മുകളിൽ പറഞ്ഞവയെല്ലാം

Answer 1

Answer:

B. i, ii and iii only

• Any limestone or dolomitic region showing typical landforms produced by the action of groundwater through the processes of solution and deposition is called Karst topography. The karst topography is also characterised by erosional and depositional landforms. 

• A polje, also called karst polje or karst field, is a large flat plain found in karstic geological regions of the world, with areas usually in the range of 5–400 km²

• ^{Dolines are formed by two main methods: the slow solutional removal of rock from the surface downward (solution doline), or by the collapse of overlying rock or overlying material into an underground cave or chamber (collapse doline).}

• ^{Humus is dark, organic material that forms in soil when plant and animal matter decays. When plants drop leaves, twigs, and other material to the ground, it piles up.}

• ^{Drapes - Rainwater drips from a cave roof's lengthy fracture, forming a continuous strip of calcites. Numerous needle-shaped dripstones hanging from the cave ceiling are called Drapes or Curtains.}