Global warming is caused by:
Increase in the level of CO2 in air.
Decrease in H2O.
Increase is both CO2 and H2O.
Increase in CO2
The study of living things in their natural surrounding is:
Environment
Ecologist
Ecology
Botanist
Where is wind energy is generated?
Solar panel
Dams
Wind mills
Bio-waste
What does World Wildlife Fund encourage?
People to save forest.
People to save wildlife.
Both a and b
People to destroy forests
Non-degradable substances left in the soil lead to:
Soil pollution
Noise pollution
Air pollution
Water pollution
What do farmers use to kill weeds?
Chemicals
Fertilizers
Pesticides
Food waste
What do pollutant gases cause?
Heavy rain
No rain
Mild rain
Acid rain
What do living and non-living things make up?
Society
Country
World
Which chemical is widely used in refrigerators?
oxygen
ozone
CFC
hydrogen
Why do people cut down forest?
Do make space for cities and farms.
For hunting.
For development process.
Both a and c
