Which of the following statement(s) is/are correct?
1- The Great Plains is an aggradational plain widest in the east and narrowest in the west.
2- The Terai plains are more marked in the eastern part than in the west due to gentle slope in the east.
3- The man constituent of khaddar is clay which at places gives way to loam and sandy loam.
4- Deltanic Plain is an extension of the khaddar Plain consists of Sand, sit, mud and clay.
Select the correct answer from the following: