Seismic studies on Earth reveal a "lost continent" that held great human cities just a few thousands years ago but is now buried beneath the Atlantic seafloor.
This is not plausible. Plates move only a few centimeters per year, so a continent could not be subducted in a few thousand years. Neither could erosional processes bury a continent on the time scale of human civilization.
Which heat source continues to contribute to Earth's internal heat?
Which of the planet's fundamental properties has the greatest effect on its level of volcanic and tectonic activity?
Ranking Task: Tectonic Activity of the Terrestrial Planets
Part A: Shown below are the four terrestrial planets of our solar system. Assume that all the planets started out equally hot inside. Rank the planets based on their expected cooling rates, from fastest cooling to slowest cooling.
Mercury Mars Venus Earth
Part B: Shown following are three terrestrial plants of our solar system. Rank the planets based on the amount of time the surface of the planet has had a moderate to high level of volcanic/tectonic activity, from longest to shortest.
Earth Mars Mercury
In general, what kind terrestrial planet would you expect to have the thickest lithosphere?