Select all of the answers that apply.

earth's temperature is maintained at an average of 15°c because of

our atmosphere's thickness
the stagnant atmosphere
the water cycle
greenhouse gases

The correct answer is option D

The greenhouse effect is the main cause that the temperature of the earth is maintained at an average of 15°C.

Greenhouse effect is the phenomenon by which global temperature is maintained. The greenhouse gases trap the sunlight falling on earth and does not allows all the sunlight to escape outside the earth.

So, the greenhouse gases maintain the temperature at an average of 15°C.

not always but somethings can be reproduced in a laboratory.