explain how a spit is formed?
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Spit is saliva (water that is full of enzymes). It comes out of the glands in our mouth continually, helping us to digest our food. How do these glands opearate? That's an exciting question with only a boring microscopic particles in action answer - but it (our ability to make molecules that are useful to us) makes us living organsims.\n\nA metallic spit grill is formed by shaping the metal.
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Clouds are formed essentially by water vapours.The uppermost layer of waterbodies like sea,river,ponds etc(specially sea) are in the process of evaporation always.now water vapour is a gas and due to the fa that the surface of the waterbodies and the earth is hotter,the watervapour expands its volume.As you must be knowing density of an object is its mass divided by volume.Mass being constant,if volume increases density decreases and the water-vapour getting lighter goes up.There the temperature being less ,the water vapour condenses into water-droplets and floats as clouds,
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This has to do w/ the way it forms in clouds.\n\nAs warm moist air rises, it will expand & cool. When it reaches the dew point, it will condense on particulates in the air such as pollen, dust, salts, pollution, etc. This is the formation of a cloud.\n\nThe condensation nuclei described above is the primary source for the shape of the raindrop that may eventually form from the cloud.\n\nAs the water droplets bump into each other, they will begin to stick, growing larger & larger.\n\nWhen wind currents can no longer hold up the droplets, gravity wins the tug-of-war & the droplet will fall.\n\nSome people mistakenly believe that raindrops are "teardrop" shaped. This is not true. They are spherical as they fall through the atmosphere. That is until they hit something.
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This will create land & sea breezes.\n\nLand (sand) gains & loses heat faster than water due to water's latent heat properties.\n\nDuring the day, the land heats up faster than the water. A low pressure will develop over the land. This means that the air above the ground is warmed & will rise.\n\nSince air pressure will equalize, air from over the sea will move inland to replace the air that was lifted. A convection current starts. This is a sea breeze. (winds are named for the direction they come from.)\n\nThe opposite occurs at night. The land cools faster than the water. Since the water is warmer at night, a low pressure cell forms over the sea.\n\nHigher pressure from over land moves toward the low pressure to equalize. This is called a land breeze b/c it comes from the land.
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Clouds are formed when water vapour in the air is cooled and condenses as part of the water cycle. Clouds consist of billions of tiny water droplets (and even ice crystals) floating in the sky and appear in a variety of shapes and sizes depending on how and where they formed.
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Not all pearls are spherical.\n\nPearls are formed when a piece of sand or grit gets trapped inside an oyster's shell.  To prevent this from irritating the oyster's soft tissues, the oyster covers it in layers of a smooth white substance, adding layer upon layer.  As more layers get added, the lump becomes larger and smoother, eventually creating a pearl.
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Waves are formed by putting directional kinetic energy into water and the surface tension of a liquid acts like a jump rope when you whip it really fast.
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Sleet is formed by snow (single ice crystals) being formed in cold clouds and then falling through warmer air so that they begin to partially melt, falling as wet snow - sleet.\n\nHailstones form by water droplets freezing very quickly in a cloud so that they form a small blob or nucleus rather than the larger crystal formed by a slow freezing snow flake crystal. The nucleus continues to fall through the cloud until it meets a strong upcurrent of warmer damper air coming up from the ground.  This blows the ice droplet up into the colder part of the cloud.  the warm air surrounding the nucleus cools and the water in it condenses out and freezes onto the surface of the existing ice droplet making it larger and heavier.  This is cycle isrepeated until the updraught is not strong enough to keep the hailstone airborne and it (and the millions of others with it) drop to the ground.\n\nThe stronger the updraught the larger the final hailstone.\n\nIf you collect some hailstones after they have dropped and use a sharp knife to cleanly cut one in half, you might be able to see the individuals layers of ice within the hailstone through a magnifying glass or microscope.\n\nHailstones can become very very big - have alook at the guiness book of records - but I believe that you Americans hold the record for a hailstone that fell in Kansas, USA, and was measured at 43.18cm (17 in) long - unfortunately no idea of the weight.
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How droplets form:\n\nRain droplets are formed from water vapor in the atmosphere that condenses onto dust particles.  Water vapor is lighter than air, but water is not.  The condensation onto the impurities in dust (nucleation) is more kinetically favorable than a sudden, rapid condensation of all the water in the air (making a splash).  This nucleation phenomena is very similar to observations you can make when you boil water (or let carbonated beverages bubble).  The bubbles will form (nucleate and grow) at tiny cracks and imperfections.  (A very smooth container will have fewer bubbles). Eventually the bubbles get big enough (buoyancy overcomes surface tension) and they rise to the surface.  The main differences between this and rain is that these gas "droplets" fall upward because of buoyancy and they have to overcome an adhesive force to start falling, whereas rain just has to fall fast enough to escape air currents.\n\nThere is another less kinetically favorable mechanism for boiling water that you can sometimes repeat in a microwave, but it is very dangerous.  If you heat water in a microwave, it is possible to get it higher than the boiling point because there hasn't been sufficient time for steam bubbles to form and grow and rise to the surface.  As soon as you touch the surface of the superheated water with say a spoon you could be providing a nucleation site and the water will suddenly boil very dangerously.  If you do this experiment, be very careful.\n\nIf rain WERE observed to fall as a sudden splash rather than as droplets, an analagous condition would be that all of the carbonation in your soda will come out in a sudden blast of carbon dioxide, making a mess and giving you flat pop instantly.  Both processes involve nucleation and growth of droplets (bubbles).\n\nHow droplets fall to the earth:\n\nAll objects heavier than the air will fall to the earth, accelerating until they reach their terminal velocity (the fastest they can go relative to the air speed because of drag).  Really small objects, like rain droplets or insects have very small terminal velocities, so they can get buffeted around without falling much.  Once a rain droplet gets big enough, it can finally fall to the ground at a reasonable speed.  It has a limit on how large it can get because the bigger it gets the faster it falls.  Some basics behind the math follow.\n\nThe terminal velocity is reached when the aerodynamic drag force exactly balances the gravitational force.  The aerodynamic drag force increases with surface area and with velocity (lets consider it to be proportional to the velocity in this example...this is true for sufficiently small objects).  The gravitational force increases with mass (or at constant density) volume.  Volume is roughly proportional to the cube of the relavant length scale of the object.  Surface area is roughly proportional to the square of the length scale of the object.\n\nThus the ratio of the drag force to the gravitional force is c*v*L^2/L^3 = c*v/L, v is the falling velocity, L is typical length scale of the object (like a meter for a person, a foot for a bowling ball, a cm for a big bug), and c is a parameter that lumps together the effects of shape, viscosity, density, and so on.\n\nSo when this ratio c*v/L = 1, the velocity must be the terminal velocity, the fastest the object can fall, v_t.  If you rearrange the equation you see that c*v_t = L.  This means that for a given object with the same physical properties and shape but differing size, the bigger object will fall faster.
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the simplest explanation is as follows:\n\n* igneous rocks are formed when molten lava is erupted on to the earth's surface and cools. i.e. basalt lavas. \n\n* sedimentary rocks are formed when other rocks (possibly igneous, metamorphic or previous sediemtnary rocks) are eroded chemically or physically and are then redeposited. i.e. sandstones and mud stones.\n\n* metamorphic rocks are formed when other rocks (igneous or sedimentary typically) are buried and then exposed to high temperatures and pressures that change the properties of that rock. i.e. marble - metamorphosed limestone.
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Clouds are formed when warm moisture laden air is forced upwards either by a physical obstruction such as a hill/mountain or by being heated by the ground/sun.\nAs it rises it cools, and cold air can hold less moisture than warm air, so the vapour condenses out into droplets that form our clouds.\n\nFog is caused when moisture laden air is cooled by contact with the ground or water, it gets colder and colder until any moisture condenses out.  Fog forms as a layer as the air above it tends to be warmer due to rflected heat from the sun and also becauseof the lack of wind to stir the two layers together.  This is often referred to as an inversion.
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A cumulonimbus cloud forms in rising air (updraft).  The air cools as it rises, and at a certain point the water vapor in the air condenses into water droplets, forming a cloud.  Around a large Cb there is often downdraft - the air gets warmer as it subsides, and any water droplets (=clouds) will evaporate.
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Something to aim your spit with.
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At convergent plate boundaries two plates collide and the heavier of the two plates is forced beneath the lighter one. As the heavier plate gets pushed down deep into the earth it begins to melt and forms molten magma. This magma slowly migrates upwards through the earth's crust where it then errupts onto the earth's surface as lava, eventually forming volcanoes. \n\nAt divergent plate zones two plates move apart from each other. When this happens a crack forms in the earth's crust. Magma from below moves upwards into this crack to fill the void 'so to speak'. Once again this magma errupts onto the earth's surface as red hot lava and we have the formation of active volcanoes.
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The gas is under pressure, so when you press the nozzel the liquid ....mmmmmm better a picture than words..\n\n http://www.aerosol.com/
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basic chemistry\n\nthey neutralize each other by forming salt and H2O
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because some body spit it over there