← Science 7 chapter 7 Export Options Alphabetize Word-Def Delimiter Tab Comma Custom Def-Word Delimiter New Line Semicolon Custom Data Copy and paste the text below. It is read-only. Select All Pangaea The name _________________ means "all land". lithosphere The ridge part of the plates of the _____________ are made of oceanic crust or continental crust and upper mantle. Convection currents __________________ _________________, occurring in the mantle, are thought to be the force behind plate tectonics. continental drift The main lines of evidence for _____________ ______________ are fossil, rock, and climate clues, and the theory of seafloor spreading. plates Earth's ________________ move around on a special layer of the mantle. asthenosphere Earth's plastic like layer is the ________________. seafloor spreading The theory of ____________ ____________ was shown to be correct by age evidence and magnetic clues. plate tectonics The theory that describes Earth's crust and upper mantle as being broken into sections is called __________ _______________. ridges The youngest rocks in the ocean floor are locacted at the mid-ocean _______________. Harry Hess The seafloor spreading theory was proposed by ___________ __________. divergent Plate move apart at _____________ boundries. convergent boundries The places between plates moving together are called_____________ ____________. earthquakes Where plates slide past one another, __________ occur. younger than Ocean floor rocks are _____________ ____________ continental rocks. Pangaea The lack of explination for continental drift prevented many scientents from believing a single supercontinent called _____________once existed. reversal Studying the ocean floor, scientists found rocks showing magnetic _________________. subduction zones Oceanic plates are pushed down into the upper mantle in __________________. fossils and rocks The presence of the same ___________ __________ on several continents supports the idea of continental drift. hot, dense material below Earth's surface is forced upward Seafloor spreading occurs because ______________________________________________________________. rift valleys & plate boundries The results of plate movement can be seen at ________________________. convection current The cycle of heating, rising, cooling and sinking is called________________ _________________. samples of rock from different locations Scientists aboard the Glomar Challenger added to the evidence for the theory of seafloor spreading by providing _____________________. Himalayas The ________________ are forming where the Indo-Australian plates collides into the Eurasian plate. continental drift The hypothesis that continents have moved slowly to their current locations is called ______________ ____________. mountains, volcanoes, ocean basins As Earth's plates move apart at some boundaries, they collide at others, forming___________,_______________,__________________________. seafloor spreading Continental drift occurs because of ____________ _______________. magnetic field The alignment of iron-bearing minerals in rocks when they formed reflects the fact that Earth's __________ _________ has reversed itself several times in its past.