why did mercury have Ice on the northpole?
436645
Because Mercury's rotation is almost perpendicular to its orbital plain, the north pole always sees the sun just above the horizon. The insides of craters would never be exposed to the Sun and scientists suspect that they would remain colder than -161 C. These freezing temperatures could trap water outgassed from the planet, or ices brought to the planet from cometary impacts. These ice deposits might be covered with a layer of dust and would still show bright radar returns.
269551
snow is composed of water and ice. \n\nthe planet saturn does not have water. its atmosphere is made of hydrogen and helium gases, ammonia, and small amounts of other gases. its core is surrounded by a shell of solid hydrogen, which is in turn surrounded by a shell of liquid hydrogen. \n\nwhile saturn does not have snow, one of its moons, titan, does. titan, with its temperature just 4 degrees centigrade above the "triple-point" temp of methane, produces methane snow and solid methane ice, methane liquid and methane vapor gas.
1171639
When the temperature rises, the particles of the mercury in the thermometer gain kinetic energy. This means that they start moving around more vigorously. The particles push away neighbouring particles. This increases the space between the particles and causes an increase in the volume of a mercury. Expansion is said to have occured.
747063
Mercury actually does have an atmosphere but the planet's small size makes it hard to retain.  It is not stable.
273200
Mercury has no true atmosphere.  It only has trace amounts of whatever gases are present.  See the given link.
259641
Atmospheric characteristics \nAtmospheric pressure trace \nPotassium 31.7% \nSodium 24.9% \nAtomic Oxygen 9.5% \nArgon 7.0% \nHelium 5.9% \nMolecular Oxygen 5.6% \nNitrogen 5.2% \nCarbon dioxide 3.6% \nWater 3.4% \nHydrogen 3.2% \n\nThe planet has a large iron core which generates a magnetic field about 1% as strong as that of the Earth. Surface temperatures on Mercury range from about 90-700 K, with the subsolar point being the hottest and the bottoms of craters near the poles being the coldest.\n\nThe mean surface temperature of Mercury is 452 K (178.8 °C /353.9 °F), but it ranges from 90 K (-183.15 °C /-297.7 °F) to 700 K (426.85 °C /800 °F); by comparison, the temperature on Earth varies by only about 150 K (150 °C /270 °F). The sunlight on Mercury's surface is 6.5 times as intense as it is on Earth, with the solar constant having a value of 9.13 kW/m².\n\nMagnetosphere\nDespite its slow rotation, Mercury has a relatively strong magnetosphere, with 1% of the magnetic field strength generated by Earth. It is possible that this magnetic field is generated in a manner similar to Earth's, by a dynamo of circulating liquid core material. However, scientists are unsure whether Mercury's core could still be liquid,[5] although it could perhaps be kept liquid by tidal effects during periods of high orbital eccentricity. It is also possible that Mercury's magnetic field is a remnant of an earlier dynamo effect that has now ceased, with the magnetic field becoming "frozen" in solidified magnetic materials.
172797
there is ice when it is cold, this is known as being frozen
795687
Some planets are too hot for water, some are too cold. The larger planets are made from methane and other gases.
1093172
Due to the weight of the glacier the ice at the bottom melts.The water is under great pressure and is forced through cracks in the ice eventually forming tunnels.Bacteria,spores and pollen have been found in glacial ice.
204871
The answer is D.  Since ice forms a complex crystalline structure instead of some amorphous solid, it is one of the only elements whose solid form is less dense than its liquid form.  This is why ice floats.  This is important biologically.  If ice did not float, it would destroy the ecosystems underwater every winter.
582015
Mercury has a very miniscule atmosphere (about two trillionths the pressure of earth's atmosphere) which consists of hydrogen and helium. Because the atmosphere is so thin, the sky is black.\n\nBecause mercury has no tilt, there are no seasons. It takes about 88 earth days to orbit the sun, and rotates very slowly (taking about 60 earth days). The temperature ranges from -168 degrees C at night, to +427 degrees C during the day. As the atmosphere is so weak (and almost non-existent), there is no greenhouse effect to retain the heat - hence the temperature quickly drops during the long slow night.\n\nFrom the surface of Mercury, the sun would appear to be three times bigger than it is on earth.\n\nVenus, being further away from the sun than Mercury, is even hotter - with a daytime temperature of 475 degrees C - due to the greenhouse effect.
160755
depends what depth.\nAt surface around -2degC\ndeeper you go (especially below the halocline) the warmer you get. -2degC is possible because the salt in the water lowers the melting point of ice to ~ -4degC.
227297
Mercury is grey for the same reason that the Moon is.  The entire surface has been reduced to a fine powder (regolith) due to billions of years of micrometeorite bombardment.  Most of the rocks are a mix of various basalts and beccias, when viewed all together they appear dark grey to the eye.\n\nThe iron on mercury does not really have a surface expresion, but is conecntrated in the interior of the planet.
413163
some of it dispursed among the earth's oceans. some of it is still frozen is polar ice caps. some is in the atmosphere. some of it is in ur toilet.
196823
The fact that ice always floats on water should give you a clue!  The ice is obviously not as dense.  So you can infer from this something has happened during the freezing process.\n\nThe structure of a water molecule is One atom of hydrogen to two if oxygen.  As the water freezes hydrogen bonds form between the various water molecules and these stop the molecules packing as effectively so the ice is less dense.\n\nTry the source below.
1036867
Of course ice and water are chemically identical consisting of H2O.  The two hydrogen atoms attach to the oxygen atom other than in a straight line (not like beads on a string).  The electron field surrounding the water molecule is uneven providing it with a "polarity" that makes it much easier to pack many molecules together in a given (rather than arbitrary) arrangement.  When water is a vapor (or steam) there is so much vibrational energy that the molecules bounce off each other maintaining a "pressure" depending on their energy (temperature).  When the molecules are a liquid, they are very closely packed and are nearly incompressible (even seven miles below the surface of the ocean!).  The bulk water expands and contracts only a little with temperature changes.  When heat is removed from the water (in a freezer?) the molecules are attracted to each other in a preferred array due to polarity and form long chains of molecules that use up space far less efficiently.  The "ice" is less dense and floats on water because the space between chains is filled with a vacuum or gases that weigh very little.  When the water is allowed to freeze in open space (a cloud?) the polarity is free to align water molecules in the most preferred orientation; a six sided snow flake.  When hoar frost forms on a cold window pane the ice forms in dendrites, like growing Christmas trees.  Hope that helps a little.
339606
no. mercury is too small to have a powerfull enough pull to hold an atmosphere