I've been of the persuasion for quite awhile now, that the earth is largely heated by an internal heat engine ...... possibly nuclear reaction in nature. If that weren't so ... the earth's core should have cooled down ages ago.Well, last night's searches seem to confirm it! About 80% of our planet warmth is the result of heat coming from under our feet, generated by nuclear decay.
This heat generator is what causes the continents to drift, collide and PUSH ... causing earthquakes. One comparison is to a pot of soup on the stove. In the middle, the liquid expands, become less dense and rises to the top ... pushing froth to the sides. The liguid circles to the outside of the pot and then falls because it's cooler, denser and heavier. The roiling action pushes the froth (continents) around.
I'm still not clear (to me) just WHERE our NAmerican continent WAS AT when the asteroid hit in the Gulf of Mexico but it IS well known that the northern part of North America was once situated at the equator. That's why there are tropical conditions preserved in the rocks and deep gorges, here in our area of Southern Alberta in Canada.
It IS known as well, that about the same time that the big asteroid hit the Americas, there was much volcanic action occurring in India, known as the "Deccan Traps." There's some speculation that possibly a NUMBER of asteroids struck ALL OVER the world and this may have triggered major cracking in the earth's plate and stimulated new rifts and volcanoes and accelerated the pushing of the India plate into the Asia plate (raising the Himalayas).