Rnd II: Waterworld Earth, predinosaur era! Anyone?

Question

Well... earth as prestine as it was before is just a ball of shallow water, with sea living creature as big as we know as dinosaurs. It has check and balance of evolution.

Then, a big meteor hits the earth in the middle(now called Hawaii) and made a crater(now called Ring of Fire). Plate tectonics developed. To balance the effect, earth distributed its displaced soils around the world and volcanoes was developed to give way to the massive volume of the meteor that earth engulfed...

Then, another evolution begun... from the sea to the land, a land that have been exposed directly to the sun... and dinosaurs as we know them has evolved from it...

Then another meteor hits the earth! This time in Mexico, that have ended the dinosaur evolution era!

Fantasy world is it not? But do you think this could have had happened?

P.S.: I know it is against Darwin's Theory and also of the present scietific findings of tectonic movements as the movements still occurs today.

Answer 1

Actually, it isn't against Evolution. You just have some of your facts wrong. You have go back more than 4 Bilion years to before the Earth had a moon. It was this asteroid strike that formed the Moon. The asteroid strike fundamentally changed the Earth. It may not have extinguished all life. Possibly, bacteria would have survived. The oceans were deeper then and the collision removed water.

Most likely there would not have been any large creatures. This is because there would have been no tidal zones. Without tides it would be difficult to develop fish that could transition to land similar to mudskippers today. Without this transition you could only get fish. However, without tides this greatly reduces the amount of nutrient rich ocean areas. The big question though is how fast the Earth spun because the off-center collision had to add to the spin. Venus spins only slowly. If the early Earth spun too slowly then you wouldn't have much more than bacteria.

You won't be able to find the crater though as it would have been too large and almost certainly involved the underlying mantle. The important thing is that the creation of the moon is what allowed plate tectonics to continue to today. Although Venus is nearly a twin of Earth it lacks a moon and plate tectonics.

Answer 2

scientia's answer is good. The "ring of fire" is too big to have been created by a foreign body collision -- it has to be a result of plate tectonics.