When animals that lived in the sea millions of years ago died underwater, their remains were gradually covered by layers of very fine dirt known as ………
a) split
b) skit
c) silt
d) dirt
Natural gas consists
primarily of…………
a) C
b) CO2
c) CH
d) CH4
The Sui is located at a distance of about …….km from Karachi in Dera Bugti, Baluchistan.
a) 520
b) 560
c) 610
d) 650
Wind has been used as a source of energy for centuries about ………..ago.
a) 3000 BC
b) 4000 BC
c) 5000 BC
d) 6000 BC
Windmills were used in Europe more than … ago to grind grains and pump water.
a) 500 years
b) 700 years
c) 900 years
d) 1100 years
…………..systems make use of the energy in running water to create electricity.
a) wind
b) hydroelectric
c) solar
d) none of these
