If Mars lost most of its water when its magnetic fields collapsed...?

Question

then why is there still frozen water at the poles? Did this polar ice somehow escape the death of Mars' protective magnetic field?

Answer 1

Just to add to the partially correct answers, the idea is that Mars' core is largely solid rather than molten. This is theorized because the planet's magnetic field is much weaker than expected. Without a molten core, you can't have plate tectonics (the movement of solid plates of the planet's crust like we have here on Earth). Without plate tectonics, you can't have active volcanos. Active volcanos release CO2 into the atmosphere on top of the other material (like lava) that comes out. Without CO2, the atmosphere is not replenished with this greenhouse gas which warms the planet (by holding in the heat from the Sun). Without heat, the water in the atmosphere will freeze.

As the reference I included says, Mars still has an atmosphere. There's enough gravity to hold on to the ice/water.

Answer 2

Mars lost most of its water not because of the loss of the magnetic field directly, but it lost its atmosphere because of that, and then it lost the water because of there being no atmosphere, the ice stays because it is moving less being frozen and trapped at and under the poles, with no place to go it will just dissapear slowly when climate changes cause the ice to move

Answer 3

It is not known for sure that Mars lost all its water because of the lack of a magnetic field. That is only a hypothesis. However there is actually not that much water at the poles. Not compared to Earth anyway. That could just be the remnant after billions of years of loss.

Answer 4

The real reason Mars lost most of its atmosphere is that its mass is too small to prevent random collisions of molecules and atoms high in its atmosphere from producing many with enough escape velocity (speed) to reach a height where they are carried away by the Solar wind. The "skimming effect" of gravitational attraction by its twin moons, Phoebos and Deimos, would have accelerated that loss. Ice would have existed much more widely, but with the loss of atmospheric pressure, in those places closer to its equator, that ice sublimated into water vapour on being heated by the sun, which then spread, and some condensed at the poles, where it is cold enough to remain stable, the rest condensing on the nightside, only to be reconverted to vapour the next day, or at the height of its summer.

Answer 5

unlike Earth which has radiogenic ability emitting from the middle, an lively climate equipment, lively tectonics and many different factors that shop Earth's center warm, Mars lacks those lively tectonics and valuable factors that Earth has. A magnetic field is led to with assistance from the molten outer center interacting with the outer center of a planet. The rotation motives convection transforming into the magnetosphere. in view that Mars' center cooled down some time previous it really is magnetic field also disappeared. Earth's magnetic field stayed as our center remained molten to this date.

Answer 6

Protected by the fact that much of it's underground, maybe.
I'm thinking that it just lost its liquid water.

Other planets moons without magnetic fields have frozen water ice too. Not much, but some. I think the fact that it's frozen is why it survives.

Answer 7

may be they were wrong. guess the polar ice kind of blows that old theorie.

Answer 8

So it seems.