Question 1: However, this so-called "________" hypothesis was unsatisfactory because its supporters could offer no convincing mechanism to produce a significant expansion of the Earth.
Question 3: The appearance of plate tectonics on ________ is related to planetary mass, with more massive planets than Earth expected to exhibit plate tectonics.
Question 4: The eight continents later re-assembled into another supercontinent called Pangaea; Pangaea broke up into Laurasia (which became North America and Eurasia) and ________ (which became the remaining continents).
Question 5: Observations made of the magnetic field of Mars by the ________ spacecraft in 1999 showed patterns of magnetic striping discovered on this planet.
Question 8: Plate tectonic theory arose out of the hypothesis of continental drift proposed by ________ in 1912[6] and expanded in his 1915 book The Origin of Continents and Oceans.
Question 9: Many millions of years later, the oceanic crust eventually descends into the ________ — very deep, narrow canyons along the rim of the Pacific Ocean basin.