what could make artificial rain?
467833
In some countries, they spray the top of the clouds ("seed the clouds") with chemicals (AgI or AgCl).  This causes the small water droplets in the cloud to grow, and finally the drops are big and heavy enough to fall to the ground in the form of rain.\n\nThe reason for doing this could be that you really don't want rain in a certain area, and you think it is a better idea to make the potential rain clouds "release the rain" in another area, before they have moved with the wind to the area you want to protect.\n\nSo, the rain is not really artificial, but the cause of the rain is artificial.
922712
there is a whole science that adresses exactly what you mention\nWATER HARVESTING\n,dig small dams every where to cath the rain water, and you can archieve that all of the rain water is absorbed by the land ,it will seep slowly into the ground to add to subteranean water suplies ,make sure that all the dams are interconnected by slow gradient ditches .just because you dont see water ,does not mean that it is not there .\nNormally a land repels water and with the rains it runs over ground into the rivers and awy.\nthink now that you want to make the land receptive or absorbent of all the water that falls on it.\n\nMULCH\ncut down the weeds before they produce seeds and leave them where they fall,they will cover the ground and put even more organic matter on top,you can use saw dust,leaves green or dry,and when you plant make a little space and plant in the mulch.this is the easiest quickest and by far most benificial way(for the quality of you soul)to prepare the land for planting\n\nto prevent weeds from coming all you have to do it turn out the lights,you can even use cardboard or black plastic(this is good for strawberries because they will rot if they touch humid ground,and the bugs can get to them).\n\nwhat you do is to cover the ground with mulch which is the same principal as compost but it includes the whole garden surface\nthe top part of the soil where the topsoil is being produced houses a world or microbiotic life.\n\nMulch is organic material green or dry that covers the ground,the thicker the better the composting process will turn it in to black topsoil\n\nthe humidity is preserved underneath and promotes the devellopment of worms(their exists no better compost than their excrements)and a variety of micro biotic life which together with the mulch produce more topsoil.\n\nthe mulch also keeps the ground temperature even and guards against the impact of the rain ,which would other wise brings salt to the surfave if on unprotected land\n\nMulch also prevents the soil from drying out because of the sun and, lay it open to wind erosian.\n\nand it turn out the lights for any weeds that want to come up\ndo not use chemicals because the water will wash them into the ground and if enough people did that, you would be guilty of helping to contaminate subteranean water suplies that other people could be pumping up to drink \n\nSUSTAINABLE FARMING\nthe best examples on this Earth of sustainable agriculture,\nare the chinampas of central Mexico ,the surviving ones(that have not been consumed by urban devellopment)have been going for more than 800 years ,that is sustainability.\nthe are built from the mud of the lakes and enriched with compost ,in the old days with the toilet contents of the outhouses that were on the bridges going into town,which the indians collected with a canoo.\n\nAnother example are the traced gardens of the Inca which have been going for more than a thousand years,there success is also because of the principle of using compost and their form which id a receptive concave absorb the rain waters and collect the dust from the wind (for hundreds of years and so increase in quality instead of the oposite.\nin the Ukraine are also examples of ancient agriculture due to no till farming and mulching(green organic matter that is added)\n\nin Mexico today are still examples from old Indian agricultural practises of diversity or companion planting.\nwhere by a series of 7 or 8 species of plants are put together or one folows the other.to create biodiversity ,and utilisation of space.\nCorn is planted for example ,wich is followed 4 weeks later by a bean that climbs it.\nand agavi and edible cactus is on the sides to protect these plants from foraging animals and add chemicals to the soil by their secretions.and others are in between to provide groundcover\n\nthere are many forms of sustainable farming in the past,and today those who follow the principles of permaculture,no till farming,organic or sustainable farmin
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
626897
Something has to keep out the rain!
882835
Probably carbon latice structures, like buckeyballs or nanotubes.  These could then contain the smaller compounds that are doing the desired work.
7169
You could make a cloud chamber. It's a chamber that's saturated with alcohol vapor so when a cosmic ray or radioactive particle enters the chamber it leaves a trail of mist like when a plane leaves a vapor trail. It does use dry ice and isopropyl alcohol though. It's kind of complicated but would be worth it in the end. You might even win depending on the competition.
900952
Do you mean air and plant production?\n\nthat would be tricky but do think a small base is feasible.
464401
1) Rainfall intensity\n2) Vegetation cover\n3) Soil type\n4) Duration of rain event\n5) Evaporation rate\n6) Degree of urban development (amount of paved surfaces)
629107
Looks Like Rain.  \n\nthe link in the source is to david dodd's online version of his book.
215070
You usually use hydroponics, i.e. you add salts of different essential macr and micro nutrients like iron oxide and potassium nitrate and add some EDTA to stop precipitation. But if yours is a low level experiment, try different types of soil --clay, sand and loam, and add in different amounts of water, maintain in diff. temp. and lighting.
550838
Well, i was involved with some folks who were catching the rain off their rooftop in barrels, then using it to water gardens etc.  They had to modify the downspouts to go into the barrels.  Any way to catch, direct and store the water will work.
410316
file will be draw due to rain
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.
731552
No, rain is caused by the evaporation of water into the atmosphere and there is no water on the moon.
254615
You would need to make a distiller of sorts - the sun's rays could evaporate the pure water, and you would just need to capture the water vapor - use a leaf or something similar to direct the vapor into a cup.  \n\nHere's a link on PBS Kids that explains it. Of course, on a deserted Island, you might not have plastic wrap, but you could very well improvise.
293854
Rain forces down cooler air from the atmosphere.
1102481
Scientists are studying how to make it rain as well as how to make it rain the right amount.