a reply to: bottleslingguy
That is possible, and I never stated it was impossible. The crust has been dated to be roughly 4.5 billion years old, in other words dates back
roughly to the same time frame as the formation of the moon. Was there a crust when the hypothesized collision occurred? Possibly, possibly not.
Most of the other planets, who have reached "stasis" as you put it, are either lacking a molten core (such as mars) or are gas giants and we have no
idea what is happening at their core. I would hardly classify Jupiter as having reached any form of stasis as it is highly active, but once again, we
have no idea what is happening at it's core. The pressures involved at that depth may totally preclude any kind of tectonic activity.
Mercury has a large iron core, it is thought, and a thin mantle and is likely only slightly more active than Mars. Mars is, in effect, dead. The moon
is dead. Venus may exhibit a milder form of plate tectonics than the earth, or not at all, depending on who you talk to.
Jupiter, Saturn, Uranus and Neptune are all gas giants, and as previously stated we have no idea what is happening with any core they may have (in
other words, the rocky part of the planet may or may not be experiencing some form of plate tectonic action).
As far as moons, there are several moons orbiting Jupiter that could exhibit such activity, no doubt caused by Jupiter's gravity and tidal forces.
Ganymede apparently exhibits such behavior. Europa also exhibits such activity with it's icy crust to some degree: Europa also likely has significant
liquid water. What Io is experiencing is something different than the traditional plate tectonics (and definition of) since it's surface is affected
by Jupiter's gravity much the same way our oceans are affected by the moon.
The sigh was for your remark regarding boiling water. For your apparent disregard or lack of connecting the dots with convection and the connection to
earth's mantle activity with is exactly that. Smarter people than you and I have likened the action in the mantle to boiling custard. Would that
description have helped?
Oh, and how is convection inadequate to describe what we are seeing? What is it that does not fit the model for you?
edit on 10-6-2014 by bbracken677 because: (no reason given)
edit on 10-6-2014 by bbracken677 because: (no reason