If the Sun is always radiating heat on Earth, why isn’t it always getting warmer?
Bodies radiate heat, and this includes both the Earth and the Sun. The rate at which they radiate heat can be found from the Stefan-Boltzmann law which gives a [math]T^4 [/math]dependence on the temperature. Thus the sun at 5800K radiates considerably more energy per unit area than the Earth at 288K, and is therefore much brighter. The radiation emitted by the Earth is mainly in the infra-red so is not visible, whereas most of the radiation from the Sun is in the visible part of the spectrum.If you do the maths, you find that the energy radiated from the Earth balances the heat emitted by the Earth. Of course, it is a bit more complicated than this because of things like reflection from clouds and absorption by carbon dioxide/methane etc.Another consideration is that some eminent scientist in the US (I think he is called Prof. Trump or something) has recently found that the physics behind all this was a hoax so if you want to work it out for yourself, you may want to read his latest tweets to find what the correct form of the equations to use actually is.
The Temperature of Earth may have been much warmer millions of years ago than it is today?
the temperature of earth has been changing a lot in the past. When the earth was formed, it temperature was very hot causing high density clouds which prevented the heat and light of the sun to reach the surface of the earth. This results in the period that the earth was known as a snowball. In this period, the earth was completely covered. This period was removed by the help of volcanic eruption in the equator. Until today, the earth temperature is said to be getting warmer and warmer due to a phenomenon called greenhouse effect. However, if you want to compare the earth temperature the temperature of million years ago, it is better to known exactly which period of the earth in the past that you are asked to compare as there has been period that the earth was completely glaciated.
Scientists generally agree that Earth is getting warmer due to what's called the greenhouse effect. A greenho?
Scientists generally agree that Earth is getting warmer due to what's called the greenhouse effect. A greenhouse used for plants stays warm because sunlight and heat coming through the glass roof are mostly trapped. The heat doesn't radiate back into the atmosphere because it's partly trapped by the glass. Something like that happens on Earth. The atmosphere acts like a blanket that keeps the Sun's heat from leaking away into space. 1. The main conclusion you can draw from this paragraph is that A. in a greenhouse, the Sun's heat is trapped by the glass. B. a greenhouse helps plants to grow faster. C. because of the greenhouse effect, plants on Earth should thrive. D. the atmosphere keeps Earth warm.
Since the core of the Earth is as hot as the sun, why don't we feel the heat from it?
The Earth's core and the solar surface are almost equally hot. But the Earth's surface and the core are separated by a huge mass of poorly conducting silicate, spanning thousands of kilometers in radial distance. This silicate doesn't conduct too well and practically prevents any kind of radiation to get to the surface. So the core's hotness is masked. On the other hand, the Sun which is much farther away from the Earth's surface is separated by a million kilometers of nothingness. This nothingness doesn't conduct any heat but provides a resistance free path to radiation. This radiation is what makes us feel the Sun's warmth.But sometimes we do feel the warmth of the Earth's inner shells directly, and we even know how to tap it successfully to produce electricity. That is the geothermal energy which manifests itself near the Earth's surface on some special sites.
When it's still hot at night, where is the heat coming from if the sun is down?
Atmosphere is the blanket of airIn day, every object including Earth surface as well as air molecules absorbs the heat energy from Sun.During night, It radiates back but radiation is very slow due to greenhouse gases. Greenhouse gases are known for absorbing heat. If you were thinking greenhouse gases are bad guys, you were wrong. Greenhouse gases help maintain warmth of Earth so that Earthlings can survive. The atmosphere acts as blanket to keep heat energy packed into the earth.But if suppose, Earth’s night lasts for very long hours, then the scenario will be completely different. Because slowly slowly heat will radiate back before Sun rises again. See Earth is so perfect. :DBut anything in excess is bad. ;) and here comes global warming in existence.
Why is ground water warm during winters and cool during summers?
Ground water is not warm or cold in winter or summer respectively….its atmosphere whose temp rise and fall during summer….but soil is bad conductor so tere is little change in temperature of ground water…..take an example….the air from your refrigerator or AC at 20°c makes you feel cool in summer which is 40°c and ground water at 30°c is also cooller but in winter which is at 5°c that all 20°c and ground water at 27°c makes you feel warmer even now ground water temperature is 3° lower compare to that of summer…….
Why is the South Pole colder than the North Pole?
Yes, the south pole is the coldest place on earth. The poles receive much less sunlight; the sun never rises above 23 degrees in the sky. And for half of the year, there's no sun at all.The north pole is pretty cold; it averages around -30F. But the South Pole is colder, around -60F.The reason is the same as why Seattle is fairly temperate, even though it's at the same latitude as International Falls, the coldest place on the continental US. It's right next to the Pacific Ocean. Water gains and loses heat fairly slowly, so it acts as a giant heat reservoir, keeping it about the same temperature all year. The wind blowing east will be moderated by that.Antarctica is also made colder by being very mountainous. Mountains are cold because the atmosphere is thinner; the atmosphere, like water, moderates the temperature. Antarctica is a land mass, which gains and loses heat comparatively quickly. (Ever been in a desert? They may be really hot during the day, but get quite chilly at night.) The North Pole is really just a lot of water; it's just frozen at the top. Dig down, or wait for the climate to get just a bit warmer, and that ice can all melt.