The greenhouse effect is a natural phenomenon that occurs on Earth, it is a process that results from the capacity of the atmosphere to absorb and emit the different heat fluxes received from solar radiation.
This process begins with the arrival of radiation from the Sun to the Earth's surface, where most of the energy is received as ultraviolet radiation. Of this energy, part is absorbed by the atmosphere (ultraviolet radiation), another part is reflected by clouds, and another reaches the planet's surface (as visible light) by heating it. Once this radiation has reached and warmed the Earth's surface, the Earth returns this energy in the form of infrared radiation (thermal energy) and is reflected and sent back to the atmosphere and space.
It should be noted that thanks to this process the temperature of the planet is compatible with life as we know it. However, pollution activities due to the fossil burning fuels and deforestation by humans have intensified the effects of this phenomenon, being the main cause of global warming.
Im green house effect, the green house gases (Co2,CFCs,N2O, CH4) absorb sun heat radiations and reflect it back to the earth surface..after re emitting absorb again these radiations
In this way gases capture radiations result in warm temperature of earth
(18° C - average temperature of earth).
If the amount of an absorber such as carbon dioxide increases, more radiation is absorbed by the Earth's atmosphere. The atmosphere radiates heat back to the surface. This is sometimes called the greenhouse effect (as the glass in the greenhouse allows sunlight to enter and blocks the escape of infrared radiation).
In this model of the greenhouse effect we can see how it works in a simplified manner. The sunlight comes to the Earth's atmosphere, some of it manages to penetrate it, while some is reflected back to space. The sunlight that has penetrated in to the atmosphere continues toward the surface of the Earth. Part of the sunlight is absorbed by the Earth, while part of it is reflected. Because of the high amount of greenhouse gases into the atmosphere, like CO2 and methane, large portion of the reflected sunlight is kept into the atmosphere, and only smaller portion of it manages to get back into the space. This causes warming up of the atmosphere, resulting in warmer and wetter climate around the globe.
The greenhouse effect is a natural process which increases the temperature of the Earth. The greenhouse effect is caused by the absorption by the surface of the Earth and re-absorption by the atmosphere of the greenhouse gases (CH₄, CO₂, NO, CFCs ) in the environment.
This is caused when solar radiation reaches Earth- some of the energy is absorbed by the land and water while the rest of the energy is reflected back into space. Now the absorbed heat radiate from earths surface is trapped by the greenhouse gases in the atmosphere which causes the warming of the Earth. But due to the increase in greenhouse gases extra heat is absorbed which leads to Global warming.
Thus, marked options in the box are correct.