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Chapter 4 Notes – Section 4.1 – Continental Drift Earth’s surface consists of a number of ____________, but moving, pieces called _______________. What is continental This idea of plate movement (_____________________ drift? _____________) was first explained when _____________ ____________________, a German scientist, discovered several pieces of evidence. What is some evidence that supports this theory? 1) 2) 3) The shape of ________________ ________________________and Africa fit together like a ______________ Similar ___________________ and rock layers are found on the edges of ___________________ that are currently not connected. ______________ Evidence. The rock record shows where some continents were once _____________, or were once covered in _______________ indicating that they once existed in a different _____________ zone. _______________________: About every _______ million years earth reverses its___________________. This change is recorded in the rock record. It shows the ___________ at which the sea floor is ______________ away from spreading centers. Section 4.2 – Plate Tectonics What causes plate tectonics? Plates move______________, away, and _______________ each other. When plates collide the _____________ plate slides under the other. (_______________crust slides under ______________________ crust) Plate movement is generated by _______________ ____________ in the mantle caused by the rising of ________________ material and the sinking of __________________ material. The stress and action at plate boundaries creates regions where ________________ and _______________________ are common. KINDS OF PLATE BOUNDARIES What are the I) different kinds of plate II) boundaries? III) _________________ Boundary: also called a spreading center. A place where two lithospheric plates are moving __________. _________________Boundary: Where lithospheric plates slide ______________ past each other. Sometimes considered to be a part of a ______________________ boundary. _________________Boundary: Where ___ plates come together. A. B. _________________ Boundary: Where two continents collide and are welded together – forming a mountain range. _________________Boundary: Where one plate is pushed under another plate. __________: ancient continent cores. The oldest and most _________rock. (example: the Canadian Shield) Sources of Continental _________________ What are some possible sources of continental growth? Deep-sea ___________________ ___________________ rock Stream __________________ ______________ – a large block of lithospheric plate that moved a great distance and then attached to the edge of a large ___________________ I) II) III)