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SAI INTERNTIONAL SCHOOL
                                                        Class 8
                                                   Lesson Notes
                                                 Subject- Physics
                                        Ch- Some Natural Phenomena

                                          Subtopic- Structure of Earth



                   Structure of Earth:

                         Crust:
                              o  The outermost layer of earth is called crust.
                              o  It is made of light rocks.
                              o  It is not in one piece but in fragments. These fragments of earth
                                 crust are called tectonic plates.
                              o  The tectonic plates are in continuous motion. When a plate goes
                                 under another due to collision they cause a disturbance in the
                                 crust which is known as earthquake.
                         Mantle: Mantle is made of solid and heavy rocks.
                         Outer core: It is made of molten iron and rocks.
                         Inner core: It is made of solid iron.
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