why is some rocks able to sink and others arent ??
914644
Any rock will sink if its density is greater than the liquid you are putting it in to. Likewise, it will float if its density is less than that of the liquid.\n\nSo, lava will usually float because it is filled with bubbles of air which makes the whole rock less dense than water. If you crush a piece of lava, the pices will probably sink.
289385
Denser materials can "float" in the sense of remaining suspended, if they are small enough; think of candle soot. The particles must be small enough so that their fall rate is dominated by their air resistance rather than their weight. Such floating is also helped by brownian motion.
689832
The object must be less dense than the fluid to float, and more dense to sink.  If it is exactly equal density, then it can be suspended.
260543
Rocks don't grow, but crystals do.  However, crystals only grow when they are imersed in the medium that contains its essential elements. You should measure it over time. It would be more accurate and convincing than just by looking at it.
747865
All the heaviest materials would be deposited first. When the force of the water falls, then the mass and weight of whatever material is being forced along with it will come into play. The heaviest of the dense material (like boulders) will be deposited first. Then whole trees (which because of their size tend to float better, but eventually the weight of them will be more than the force exerted on them). Then smaller rocks, etc, etc, etc, until you get down to light silt which would be the last particles to fall to the stream bottom.
39301
Think of it this way:  If an object weighs more than it would if it was made of water, it will sink.  If an object weighs less that it would if it was made of water it will float.\n\nA coin is made of solid metal which makes it denser than water, therefore heavier.  It will sink.  A ship is made of metal also, but NOT solid metal.  It also consists of other materials but mainly air (inside the ship).  This means it's lighter than water, which is why it will float.
209077
THere are layes of the ocean with differing salinity (salt) concentrations.  I don't think that a layer as you described could exist.  Buoyancy is a result of several factors.
108792
They are made of wood, which floats because it has a lower density than water.  If you made a ship out of solid gold, it would sink, for example.
289316
They are often different due to the different water temperatures.  The total amount of dissolved salt in water decreases with temperature.
566264
It has all to do with the law of floatation.\n\nA piece of metal will sink to the bottom of a tank of water because its weight is GREATER than the weight of an equal volume of water. \n\nLikewise, a piece of wood or plastic will float because its weight is LESS than the weight of an equal volume of water.\n\nA ship may weight tonnes. However, its overall weight IS LESS THAN the weight of an equal volume of water.\n\nIf you are able to measure the total volume of the ship, you will find that the WEIGHT INSIDE this volume IS LESS than the weight of an equal volume of water.\n\nSo the ship can float.
962499
There are many different sedimentary rocks but only three basic causes.\n\nFirst is where rock is weathered out and is washed down into valleys and rivers where it forms a mud and is then pressured to turn into rock.\n\nThe other is the sea floor where the same silt settles and becomes a thick layer over the years.  Then either the sea recedes or the land is thrust up leaving the mud high and dry as sedimentary rock.\n\nLastly we have limestone and chalk where sea creatures die, sink to the ocean floor and accumulate.  This then follows the same upthrust or ebb of the sea and is exposed as rock on the mainland.
366249
Depends on the kind of rock.  Some of them probably won't dissolve easily -- you'd have to pulverize them first.
874425
u should try coins and other metals, also try sponges and cloth and things that u are sure wont float.  u mite be suprised with what u discover.
1126388
Surface tension and elasticity of the water are just about the same thing, for all practical purposes. The water can not get out of the way fast enough to let the stone sink before the motion and deflection cause the stone to bounce. The gyroscope motion of the stone is what gives it enough balance to not lose much of it's momentum when it hits something, like water. That's why flat, smooth stone work best.
143007
due to formations bearing bentonite type clay bases. in very basic terms they are like a dryed out sponge when water is added they swell. also when the bottom hole temps get too high your mud will cook out if water based. go online and look up mud logger or mud logging you should find some very useful info there or knowlage as to where to go for futher search
566155
it's to do with the magnetic field of the water and or the geology. I did gold exploration for several years and on weekends we'd help the local farmers source underground water. And we used both a magnetometer to chec k for magnetic anonamalies amd then walked exactly the same path with a diving rod, a piece of fence wire and the rod would move at exactly the same places we found magnetic kicks with the magnetometer.
972025
Well, the rocks don't float away because even though they may float very high, they still come back down, they usually don't have enough velocity to break the gravitational pull of the moon, even the shuttles are effected by gravity, but it SEEMS weightless because they're in a state of constant freefall while maintaining a certain horizontal velocity so they orbit the earth, in simpler terms, they're falling over the side of the world all the time.  Anyway, those rocks that may fly up, come back down, and they bounce, however they don't bounce as high, and eventually come to a rest, and as for anything that's not bolted down floating away, that's just stupid, because the moon has gravity, it's only 1/6th of Earth's gravity, but it's still there. (By the way, the level of stupidity in your question is aggravating me.)  The moon suits had to be weighted so when the astronaughts pushed on the ground with their feet, they didn't just blast off about a hundred meters into the sky.\n\nPS.  ANYONE who asks that sort of question sounds like an uneducated mendicant.\n\nPPS. If yer curious about my age, I'm 17