Why is rain naturally acidic?
336031
When rain drops fall through the atmosphere CO2 becomes dissolved in the water. Dissolved CO2 makes water acidic.\nCO2 is a normal component of the Earth's atmosphere, thus the rain is considered naturally acidic.
950529
acid reacts with the organs present in our body.they will corrode,since they have the property of corrosion.hence acid is dangerous to human beings.
62342
Acidity is when an excess of H+ binds H2O as H3O+.  Strong acids are ones like HCl, which in solution will ionize completely--Cl-, being very soluble, will let go of H+ to make the solution acidic.  Other "weak" bases are ones that do not necessarily ionize completely.  Excess H+ will bind to sites in the weak acid molecule rather than binding to H20, meaning that the pH will not be as low (low pH < 7 = acidic).  In this way, a weak acid can act as a buffer--in pure water, it will ionize to a certain extent, but with excess H+, it will bind more H+, but the free H+ in solution will only change very little, and the pH remains rather stable.
373520
Acidic rainfall dissolves soluble rock, such as limestone.\n\nThis article has some examples and pictures of Karst topography:  http://en.wikipedia.org/wiki/Karst
250805
mostly hydrogen sulphide from coal burning power plants. It dissolves in the rain to make sulphuric acid H2SO4
652652
Actually, no one has quite gotten into the reality.  Rain is almost all rain.  But something like 99% of all precipation drops form around something called condensation nuclei.  Basically that's a fancy term to say some small particle in the air.\nThis can be dust, clay, sea salt, pollutants (leading to smog, acid rain, etc), even tiny insects... whatever's available.  Water actually takes advantage of the particle's curvature, allowing water to condense even though the air isn't 100% saturated.\nCloud seeding is an attempt to induce additional rainfall by adding more particles.  It is only marginally useful in most places.\n\nThere are also small amounts of mixed in gases (nitrogen and oxygen mainly) and any other pollutants the raindrop comes into contact with while falling through the atmosphere.\n\nBut mainly rain is just water.  Awesome stuff, too!\n\nHope I helped,\nGod bless,\nShane
1113363
The first thing to come to my mind is if you're talking about convective rainfall, which requires the ground to heat up.  If you have a layer of say altostratus clouds (with no precip) move over an area, the solar heating will decrease and this could halt any convective clouds that may have been forming, and which may have produced rain if the heating had continued.  But this is just off the top of my head.
474398
HOW ACID RAIN IS FORMED\n\nAcid rain is caused by the release of the gases SO2 (sulphur dioxide) and NOX (nitrous oxides). The main sources of SO2 in South Africa are coal-fired power stations and metal working industries. The main sources of NOX emissions are vehicles and fuel combustion.\n\nSulphur dioxide reacts with water vapour and sunlight to form sulphuric acid. Likewise NOX form nitric acid in the air. These reactions takes hours, or even days, during which polluted air may move hundreds of kilometres. Thus acid rain can fall far from the source of pollution. \n\nWhen mist or fog droplets condense they will remove pollutants from the air and can become more strongly acid than acid rain. Even snow can be acid. Gases and particles, not dissolved in water, with a low pH can also be deposited directly onto soil, grass and leaves. It is possible that even more acidity is deposited in this way than by rain! Not much is known about this process, and it is particularly difficult to study.\n\nhttp://www.botany.uwc.ac.za/Envfacts/facts/acidrain.htm\n\nhttp://www.botany.uwc.ac.za/Envfacts/facts/acidrain.htm
1036321
The individual drops of rain usually form as pure drops of water.  As these drops fall, they encounter gases in the atmosphere which can be absorbed and react with the water.\n\nMost of the gases are oxides of nonmetal elements.  When they react with water, they form acids.  This is the source of "acid rain."\n\nFor example Nitrogen dioxide reacts with water to form nitric acid.
875267
by the effect of wind.\n      the rain comes from too height & there the speed of air is very fast 'n' due to it the angle deflected.this deflected angle is very short but the height is too large so it seems like a big deflection.
841635
The process that leads to acid rain begins with the burning of fossil fuels. Burning, or combustion, is a chemical reaction in which oxygen from the air combines with carbon, nitrogen, sulfur, and other elements in the substance being burned. The new compounds formed are gases called oxides. When sulfur and nitrogen are present in the fuel, their reaction with oxygen yields sulfur dioxide and various nitrogen oxide compounds. In the United States, 70 percent of sulfur dioxide pollution comes from power plants, especially those that burn coal. In Canada, industrial activities, including oil refining and metal smelting, account for 61 percent of sulfur dioxide pollution. Nitrogen oxides enter the atmosphere from many sources, with motor vehicles emitting the largest share—43 percent in the United States and 60 percent in Canada.\n\nOnce in the atmosphere, sulfur dioxide and nitrogen oxides undergo complex reactions with water vapor and other chemicals to yield sulfuric acid, nitric acid, and other pollutants called nitrates and sulfates. The acid compounds are carried by air currents and the wind, sometimes over long distances. When clouds or fog form in acid-laden air, they too are acidic, and so is the rain or snow that falls from them. \n\nAcid pollutants also occur as dry particles and as gases, which may reach the ground without the help of water. When these “dry” acids are washed from ground surfaces by rain, they add to the acids in the rain itself to produce a still more corrosive solution. The combination of acid rain and dry acids is known as acid deposition.\n\nKKG
757187
As the user stated before, this is a purely psychological effect, nothing to do with chemisty. I would assume if this is for a chemistry assignment, you might want to consider something more chemical in nature. \n\nAs for why you feel gloomy, I assume that for the most part, rainy weather is dark and wet. This dark period of time causes the body to react as if it is night time, making you very sluggish and gloomy. After a period of rain, the body reacts to the new sunshine and nicer weather, causing an uplifting of the body, causing the body to feel refreshed and back to normal. \n\nAgain, this is purely psychological, and has nothing to do with chemistry. Hope this helps!
759411
Acidic.  Citric acid.
1055128
Rain and sun promote chemical reactions, leaching material out of the poop. What are left are the chemicals that do not dissolve in water - mostly potassium nitrate. This is one of the ingredients for making gun powder and, in days gone by, manure was an important resource for the military!
978270
That depends on where.  Most, if not all, chemical weathering is directly caused by water, so the rainiest month would do the most.
924662
I did a demonstration on the affects of acid rain on plants once.  I used 5 identical, healthy house plants and watered them everyday with varying ratios of a water:vinegar mixture.  Pure water, 5 parts water:1 part vinegar, 5:2, 5:3, 5:4 and so on.  I recorded my observations each day for 10 days.  The impact that the acidity had on the plants with high vinegar ratios was pretty neat to watch and document.  You of course would have to explain how the vinegar acted like acid rain would but there are plenty of resources for this on the net.
293854
Rain forces down cooler air from the atmosphere.