Greenhouse Effect

what is the layer of the atmosphere that contain greenhouse gases?

• exosphere

• thermosphere

• troposphere

• stratosphere

how human contribute to the increasing of greenhouse gases, except?

• burning trees

• use of refrigerator

• burning fuels

• none of the above

what gas from the list below cause global warming?

• carbon dioxide

• oxygen

• atmosphere

• water vapor

(a)   is the gradual increase of temperature of the earth atmosphere and ocean.

The Earth acts like a greenhouse that catches and traps heat from the sun.

• true
• false

Without the Greenhouse Effect the Earth would be

• warm 
• cold
• dead