Solution:
People of north Africa are generally Berbers. The inhabitants of Northern Africa are generally divided in a manner roughly corresponding to the principal geographic regions: The Maghreb, the Nile Valley, and the Sahara. Northwest Africa on the whole is believed to have been inhabited by Berbers since the beginning of recorded history, while the eastern part of Northern Africa has been home to the Egyptians, Abyssinians (Ethiopians), and Nubians (Sudanic descent), although ancient Egyptians record extensive contact in their Western desert with peoples that appear to have been Berber or proto-Berber.

Solution:
Descending order of countries in literacy rate:- Sri Lanka > India > Pakistan > Bangladesh (in 2006). At present, Sri Lanka (92%) > India (72%) > Bangladesh (61%) > Pakistan(56%).

Solution:
Equatorial forest and Tropical deserts are low-density area.

Solution:
Scandinavia is a suitable country for exploiting hydroelectricity because of the presence of Lakes.

Solution:
The winter snow-house or Eskimos is known as Igloo. Eskimo houses are called "igloos" which are made by blocks of ice cemented together with snow. They live in Igloo during winter to protect themselves from the severe cold outside since the heat is locked up inside and make it habitable.

Solution:
The Ganges and the Brahmpautra together form the world's largest delta. The delta is shared by both India and Bangladesh. It has an area of more than 105,000 sq. km. and is one of the most fertile regions of the world. The river is drained by both the Ganges and Brahmaputra, alongwith their tributaries and distributaries.

Solution:
The moat abundant element in sea water is Chlorine. Seawater contains 19,000 mg of chlorine per liter.