Fill in the Blanks 1 - Earth´s Moving ContinentOnline version Chapter 5, Lesson 2: "Earth´s Moving Continents". Use your textbook to help you fill in the blanks pages 254 - 263. Click the word. by Naneth Burquez 1 rock ocean magnetism ridges plate tectonics magma volcanic spreading drift supercontinent seafloor continental ridges parallel Are the continents moving ? 1 . - On the basis of gathered evidence . Alfred Wegener concluded that all the continents had once been part of a single . 2 . - Wegener's concept that the continents drifted apart to their present position became known as . 3 . - A scientific model called explains that the surface of Earth is made up of plates that move . 4 . - Plates move over the hot , fluid rock , or , in Earth's mantle . How do oceans change size ? 5 . - As some crustal plates move apart , magma flows outward and hardens to form raised structures called on the ocean floor . 6 . - The process in which new rock forces the plates on the ocean floor to move farther and farther apart is called . 7 . - Rock found at mid - is younger than the rock that makes up the continents . 8 . - The ocean floor is largely made up of formed by magma from Earth's mantle that cools and hardens . 9 . - Further evidence for seafloor spreading is provided by the of seafloor rock .
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