My view is that it is generally accepted by geoscientists that convection of some form occurs within the mantle, and this is responsible for the heat distribution observed in the Earth. Surge tectonics, on the other hand, disputes mantle convection. This is science at work, obviously, aiming to put forward hypotheses to explain as much of the observable evidence as possible. I would support the theory of Plate Tectonics, with mantle convection as the basic driving force. Other factors, such are ridge push and slab pull, may be involved. The proposition of alternative hypotheses such as surge tectonics is how science works, however most geoscientists would favour Plate Tectonics as the unifying theory of global tectonics. Continental drift remains valid, but explains only the movement of continents as they 'ride' on tectonic plates that have boundaries generally unrelated to continent shapes. In relation to theories of an expaning earth, I think there is no direct evidence - in fact, the most recent measurements would seem to show that the earth is contracting very slightly.
Stormy conditions will become widespread over Ireland later this morning and during the afternoon. Stormy conditions will continue this evening but will moderate from the west overnight. Gale force westerly winds will gust between 100 and 120 km/hr generally, but gusts of up to 140 km/hr are expected in exposed parts of Connacht and Ulster. These winds are likely to lead to some structural damage and will be accompanied by high seas on Atlantic coasts.
Originally posted by zenius
reply to post by PuterMan
So is it ok with everyone to discuss plate tectonics & the core in this thread, or should we start a new general discussion for this....don't want to be off topic.