What are those clouds that form a straight line in the sky?
112412
Hard to say form such a vague descrition. As omegawulf666 says, they could be jet contrails if you are only seeing one at a time. \n\nOr you could be referring to radiatus clouds, which form multiple parallell lines (although they often seem to converge on the horizons, like train tracks).\n\nThe one thing they defintitely are not are jet streams. A jet stream is a type of wind. You can't see wind.
1017302
Atmospheric refraction is the deviation of light or other electromagnetic wave from a straight line as it passes through the atmosphere due to the variation in air density as a function of altitude.\n\nAtmospheric refraction near the ground produces mirages and can make distant objects appear to shimmer or ripple.
709967
Clouds are characterized by their height.  Low, medium, high, and extensive vertical development.  Then they are given prefixes and suffixes such as "nimbus" for rain clouds, and "alto" for low clouds, just to name a couple.  There are two main types of clouds: Cumulus (which are the puffy white ones)are associated with an unstable atmosphere, good visibility, and intermitten precipitation. Stratus (which are long and skinny) on the other hand are associated with a stable atmosphere, poor visibility, and steady precipitation.
58079
the sun is covered by a cloud
1116707
droplets of water that condense on what are called condensation nuclei...which are small particles of matter that are suspended in the atmosphere (sand, sea salt, dirt etc)\n\nwhen the air temperature and dewpoint (the temperature the air needs to be to be "saturated") meet, the air condenses into a liquid form, which then attaches itself to the condensation nuclei....which in turn..gives you your cloud.
155340
This question is difficult to answer because is diffuclt to define things precisely. If we consider cumulus clouds we gotta consider they are different sizes and some are broken in more pieaces. But there are many types of clouds , like for example consider the nimbus clouds (storm clouds) that might cover the whole of the sky for an area 100 kilometres \nin any direction.\nTalking about the weight of a cloud is not sure what the meaning is. Are we referring to just the weight of the ice crystals in the cloud, or do we also include the weight of the air contained in the cloud. \nHowever the  avarage weight of a cloud can be determined or more corectly said estimated in 2 ways . \nThe first and easiest is by thinking about the rainfall it might. For example, studies showed that  a volume of 200 000 cubic metres of water would weigh 200 000 tonnes \nproduce.\nThe other way of estimating the weight of the cloud is a bit harder and it considers the water content of the parcel of air it comes from. For example, studies showed that the ice in a lump of cloud that comes from an air parcel about 1 km long by 1 km wide by 200 m thick turns out to weigh 1 600 to 3 200 tonnes.\nIf you have ever looked at satellite photographs of cloud, you will have seen tropical cyclones (hurricanes), where a bank of unbroken cloud stretches for perhaps 300 to 500 km or even 1000 km in all directions from the centre of the storm. If you regard these as single clouds, then they are huge. Wispy, high altitude clouds, on the other hand, can be really very thin and light.
213534
They stay in the sky because they are part of our atmosphere. \n\nDefinition of a cloud - A visible body of very fine water droplets or ice particles suspended in the atmosphere at altitudes ranging up to several miles above sea level. \n\nThey aren't forced to drop to the ground unless they become larger droplets or bigger ice particles forcing them down by gravity - which is what would be rain or a storm.
296179
Losing yourself in the skies and clouds are natures gift to us. I've seen objects, faces and "calming" designs. Cloud formations are majestic, serene, power and forces you to daydream and go to places only in your heart and mind. Clouds bring out the best in ones mind and with its changing of texture and color warn us of danger. A great "present" given to all by Mother nature.Give thanks, enjoy it and protect it.
1153958
You're obviously not looking hard enough!  After it's been raining (not this week) and the sun is coming out again, look at a cloud, a dark one is better than a light one, and you should be able to see how the edge of the cloud appears to be lined with silver
103208
Yes. See the cloud types shown here --- http://www.ccrc.sr.unh.edu/~stm/AS/Weather_Toolbox/Cloud_Classification.html\n\nAltostratus is about half-way down the page
177417
Pictures of a cloud? Try this link:\nhttp://images.google.com/images?svnum=10&hl=en&lr=&q=clouds\n\nIf you need pics in the future, both Google Image Search and Yahoo Image Search will give you whatever pics you need.\n\nHave a nice day,\nTerras
69346
Sun pillars are formed by reflections from ice crystals in certain high altitude clouds.
375813
Sky is blue because air is not perfectly transparent.  If you look through many miles of it, it gives a bluish color. [This is another way of saying that blue light is scattered by the atmosphere.] The only direction in which you can look through enough miles of air is upwards.  \n\nClouds are not always white.  Clouds can also turn grey or black and they are made out of the very same water molecules they were before.  It all has to do with how large the particles are, when the cloud is newly formed all the water droplets are very tiny and therefore all light is reflected, ie they look white.  As the tiny droplets glom together into larger pieces of airborne water, light can be absorbed more and more, and the cloud turns darker.
197968
the three major cloud names...\n\nby form:\n1.)cumulus: puffy fair weather clouds\n2.)stratus: thick blanket like clouds\n3.)cirrus: "mane's tails" made of ice crystals & usually tell of approaching bad weather\n\nby height (prefix):\n1.)cirro- high altitude\n2.)alto- mid altitude\n3.)strato- low altitude\n\nthe prefix nimbo may be used if it is actually raining from a cloud.\n\nso you have combinations such as cirrostratus, altostratus, stratus, nimbostratus, cumulus, altocumulus, cirrocumulus, cumulonimbus (thunderheads), etc.
1156831
Those are called contrails.  They are CONdensation TRAILS.  The hot jet exhaust hitting sub zero temperature air [it's like 40 below at 40.000 feet] condenses the moisture out of the air to form cloud trails.
639268
a line with no slope..a straight line ----------
1034117
no clouds are not solid they are made  up of water  vapor and gas. Clouds are formed when air contains as much water vapor (gas) as it can hold. This is called the saturation point, and it can be reached in two ways. First, moisture accumulates until it reaches the maximum amount the volume of air can hold. The other method reduces the temperature of the moisture filled air, which in turn lowers the amount of moisture it can contain. Saturation, therefore, is reached through evaporation and condensation, respectively. When saturation occurs, moisture becomes visible water droplets in the form of fog and clouds.\n\nIt should be noted that condensation by itself does not cause precipitation (rain, snow, sleet, hail). The moisture in clouds must become heavy enough to succumb to gravity and return to earth's surface. This occurs through two processes. In cold clouds ice crystals and water droplets exist side by side. Due to an imbalance of water vapor pressure, the water droplets transfer to the ice crystals. The crystal seventually grow heavy enough to fall to earth. In the second process, water droplets in warm clouds collide and change their electric charge.Droplets of unlike charge attract one another and merge, thereby growing until they have sufficient weight to fall.\n\nThere is no difference between fog and clouds other than altitude. Fog is defined as a visible moisture that begins at a height lower than 50 feet. If the visible moisture begins at or above 50 feet, it is called a cloud. Two common types of fog are called radiation fog and advection fog. Radiation fog forms during the night as the earth's surface cools and the air immediately above it cools in turn by conduction. If the air is moist enough, the cooling causes it to reach saturation and visible water droplets form. We often call this type of fog ground fog because it lies so close to the surface. Advection fog forms when warm moist air moves over a colder surface (advection means to move horizontally). A perfect example is on the west coast of continents. Prevailing westerly winds move moist air from over a warm ocean area to over the colder waters off the coast. Fog forms and is carried by the westerly over the land.\n\nClouds can form anywhere in the troposphere, and although condensed liquid, they are light enough to float in the air and move from place to place by the wind. Clouds are classified according to appearance and height. Based on appearance, there are two major types: Clouds of vertical development, formed by the condensation of rising air; and clouds that are layered, formed by condensation of air without vertical movement. When clouds are classified by height, there are four classes: high, middle, low, and vertical development.\n\nCloud names, of which there are twelve, combine appearance and height. A brief description of the root name will indicate this combination of features.