What is the product of seafloor spreading?
Seafloor spreading occurs at divergent plate boundaries. As tectonic plates slowly move away from each other, heat from the mantle’s convection currents makes the crust more plastic and less dense. The less-dense material rises, often forming a mountain or elevated area of the seafloor. Eventually, the crust cracks.
What do you know about Pangea?
Pangea existed between about 299 million years ago (at the start of the Permian Period of geological time) to about 180 million years ago (during the Jurassic Period). It remained in its fully assembled state for some 100 million years before it began to break up.
How big asteroid that killed the dinosaurs?
It was tens of miles wide and forever changed history when it crashed into Earth about 66 million years ago. The Chicxulub impactor, as it’s known, was a plummeting asteroid or comet that left behind a crater off the coast of Mexico that spans 93 miles and goes 12 miles deep.
Do we have any dinosaur DNA?
The tiny fossil is unassuming, as dinosaur remains go. DNA begins to decay at death. Findings from a 2012 study on moa bones show an organism’s genetic material deteriorates at such a rate that it halves itself every 521 years.
Can you see the crater that killed the dinosaurs?
It is the second largest confirmed impact structure on Earth, and the only one whose peak ring is intact and directly accessible for scientific research….Chicxulub crater.
| Impact crater/structure | |
|---|---|
| Country | Mexico |
| State | Yucatán |
| Chicxulub crater Location of Chicxulub crater Show map of North America Show map of Mexico Show all | |
What happened on Earth 12000 years ago?
In Ragnarok, Donnelly argued that an enormous comet struck the Earth approximately 12,000 years ago, destroying an advanced civilization on the “lost continent” of Atlantis.