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Name: _____________________________ Date: ____________ Period _________ Ch. 7 Plate Tectonics I. What is Plate Tectonics? __________________________________________________________________ __________________________________________________________________________________________ Inside the Earth Ch. 7 Sec. 1 •What do you think the inside of Earth is like? ____________________________________________________ II. Composition of the Earth A.Earth is divided into ___________ layers- the crust, mantle, and core. 1. Earth’s layers are arranged by their ___________________________ III. The Crust A.Crust- Earth’s outer layer. Also the _____________________________ layer 1. Solid rock that includes dry land and ocean floor. 2. ________-_________ km thick. 3. Two types- (1.) ________________________ crust = basalt, more dense (2.) _________________________crust = granite, less dense IV. The Mantle A. Layer between the ____________________________ & _______________________________ B. Mantle is Earth’s _____________________________________ layer. C. Mantle is made up solid rock and very thick magma. V. The Core A. made up mostly of ____________________and ____________________________. B. Core extends from the bottom of the _______________________ to the _____________________ of Earth. C. The planet _____________________ could fit into Earth’s core. VI. The Structure of the Earth A. Earth is divided into five main physical layers 1. Lithosphere- outermost, rigid layer. Made of two parts. a. the _________________________ b. the rigid upper part of the _______________________ B. Asthenosphere- soft layer of the ___________________________ on which pieces of the lithosphere move. 1. made of solid rock that flows very slowly C. Mesosphere- beneath the asthenosphere. Strong, lower part of the mantle. 1. Extends from the bottom of the asthenosphere to the core. D. Outer Core- _______________________ layer of Earth’s core that lies below the ____________________ 1. Surrounds the inner core. D. Inner Core- ____________________________, _______________________________ center of our planet VII. Tectonic Plates A.Pieces of Earth’s ______________________ that move around on the asthenospere. 1. The Earth’s plates are like pieces of a puzzle. 2. Plates can be either _____________________ crust, _______________________ crust or both. VIII. Mapping Earth’s Interior •How do we know so much about the mantle and core? 1. Seismic Waves- vibrations created by _______________________________that travel through Earth 2. When seismic waves travel through different materials they travel at different ___________________