Chemistry
Dry powder fire extinguishers contain

Sand and sodium carbonate
Sand and sodium bicarbonate
Sand
Sand and potassium carbonate

ANSWER DOWNLOAD EXAMIANS APP

Chemistry
Water cycle refers to

Constant movement of water from ocean to land and back to ocean once again
Scientific management of water in areas excessively plagued with water-logging
Water distribution in relatively dry areas
An integrated attempt to recycle water in relatively arid regions

ANSWER DOWNLOAD EXAMIANS APP