Title: what sustain life on earth ? – planeteerdelhi
Headings: what sustain life on earth ?
what sustain life on earth ?
2) The cycle of matter
3) Gravity
What happen to solar energy reaching the earth ?

Content: what sustain life on earth ? – planeteerdelhi
May 20, 2011
May 21, 2011
what sustain life on earth ? Life on earth depends on three interconnected factors
1) The one way flow of high quality energy from sun through material and living things in their feeding interaction into environment as low quality energy (mostly dispersed into air or water molecule at law temperature ) and eventually back into space heat .no round trip are allowed because energy cannot recycled
2) The cycle of matter
(the atoms , ion , or compounds needed for survival by living organism ) throuhg parts of the biosphere . because the earth is closed to significant inputs of matter from space essentially fixed supply of nutrients must be continually recycled to support life . All nutrients trips in ecosystem are round trips
3) Gravity
which allows the planet to hold on its atmosphere and enables the movement of chemicals between the air , water soil and organism in the matter cycles
What happen to solar energy reaching the earth ? Solar energy , flowing through the biosphere warms the atmosphere , evaporates and recycles water generates wind and support plant growth
About one billionth of the sun’s output of energy reaches the earth – a tiny sphere in the vastness of space – in the form of electromagnetic waves mostly as visible light . Much of this energy is either reflected away or absorbed by chemical in planets atmosphere
Most solar radiation making it through the atmosphere is degraded into longer wavelength infrared radiation . This infrared radiation encounters the so-called greenhouse gases in the troposphere . As it interacts with these gaseous molecules , it increases their kinetic energy helping warm the troposphere and earth surface . without this natural greenhouse effects the earth would be too cold for life as we know to exist