chemistry

which of these is not a natural source of energy

• petroleum

• tidal energy

• wind energy

• solar energy

which of these emit fewer pollutants

• coal

• LPG

• CNG

• petroleum

what is tidal energy

• the energy produced from waves

• the rise and fall of the tide

• both a and b

planting trees reduce pollution by

• giving out carbon dioxide

• increasing the temperature

• absorb carbon dioxide

• absorb water

which of these reduce air pollution

• clay stove

• gas stove

• electric stove

• both a and c

What is the chemical formula for water?

• 2HO
• H2O
• HO2
• H2O2

which of these is not a domestic use of water

• drinking

• farming

• bathing

• cooking

---------------------------------contamination of water is caused by the presence of living organisms, such as bacteria or viruses.