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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 ___________________