The longest period (lowest order) modes penetrate the core whereas higher order modes mainly sample the mantle. This is split into two sections: the inner and outer core. LS23 6AD, Tel: +44 0844 800 0085 ĭ�}��B=%�n Earth's place in the Solar System and how it formed. 214 High Street, At the centre of the earth lies the core. Pizza the Earth activity, pp. Reach the audience you really want to apply for your teaching vacancy by posting directly to our website and related social media audiences. I'm passionate about all geographical events and am a keen blogger. [%���Q���i#p��t���BQo5'a Ȯ�0�$$��%�,��V���Ȥ�R����VގT��KŧB��a ��|Q��5��� endstream endobj 153 0 obj 617 endobj 128 0 obj << /Type /Page /MediaBox [ 0 0 792 611.99001 ] /Contents 138 0 R /Resources 129 0 R /Parent 118 0 R /CropBox [ 0 0 792 611.99001 ] /Rotate 0 >> endobj 129 0 obj << /ProcSet [ /PDF /Text /ImageB ] /Font << /F15 147 0 R /F31 143 0 R /F19 131 0 R /F18 150 0 R /F17 137 0 R >> >> endobj 130 0 obj << /Type /FontDescriptor /Ascent 689 /Descent 194 /CapHeight 689 /XHeight 431 /ItalicAngle 0 /StemV 65 /StemH 20 /FontName 132 0 R /FontBBox [ -34 -250 988 753 ] /Flags 6 /FontFile 133 0 R >> endobj 131 0 obj << /Type /Font /Subtype /Type1 /FirstChar 38 /LastChar 246 /Widths [ 762 272 381 381 490 762 272 326 272 490 490 490 490 490 490 490 490 490 490 490 272 272 762 762 762 462 762 734 693 707 748 666 639 768 734 353 503 761 612 897 734 762 666 762 721 544 707 734 734 1006 734 734 598 272 490 272 490 762 272 490 544 435 544 435 299 490 544 272 299 517 272 816 544 490 544 517 381 386 381 544 517 707 517 517 435 490 272 490 490 0 0 0 0 0 0 0 0 0 0 0 1146 0 0 0 0 0 0 0 0 612 0 272 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 612 816 762 680 653 734 707 762 707 762 707 490 490 490 272 272 462 490 272 490 979 490 571 544 544 816 816 272 299 490 490 490 490 490 734 435 490 707 762 490 884 993 762 490 490 598 435 ] /BaseFont 132 0 R /FontDescriptor 130 0 R >> endobj 132 0 obj /GDJBMX+mvr12-167-1000 endobj 133 0 obj << /Length1 1380 /Length2 6902 /Length3 532 /Length 8814 >> stream It varies in thickness from just 1km in some places to more than 80 kilometres in others. The diÞering sensitivities of the oscillation modes are used to reßne models of the Earth’s internal structure. Oceanic crust forms the bed of the world’s oceans and is thinner and younger as it is constantly renewed when it is subducted into the mantle and reappears as new crustal material at subterranean constructive margins, such as the Mid-Atlantic Ridge. This means it floats on the mantle with more buoyancy and it is the denser oceanic crust that descends into the mantle when the two types of crustal material collide at destructive margins. �n�O4��d�C�! 3. minerals and rocks, including the most important minerals and rocks for understanding natural disasters. Continental crust, on the other hand, is older and much thicker (on average 36 km thick) and yet, despite its thickness, it is less dense material than that which forms oceanic crust. There are two types of crust: oceanic and continental. This is split into two sections: the inner and outer core. 54-55 and Masters 12, 15, 17, and 18 of Earthquakes (Tremor Troops) - A Teacher’s Package for K-6, FEMA/NSTA, 169 pp., 1988 (note mistake in scale on page 55). The mantle is the thickest layer, being approximately 2,800 km thick. w”m3����)g �~��r����喳��O���宇���#�`l�H�4�w��ɬ(C{��;���R�C��j��[|��L������n~v���:��[�e����ɢ����]ƏM$��f���g}N��S�h|���y�9iD� /�usA`5��T�B8i p�p���~�e��[2��?d�W��d�S���f��� xAr�O�G�XOr����:Z#Ou�?T���w��kE ���^j]���F"� ����V_o9٣�]z�����\�M �D�]*ڍ�E����j B�k�#"�����ijy���=�%�3L�����U������&:V��q#���2�PߠWoS�V��4�ö�J��|N�~�:�{�1��w�x���Ӷ���F�FQ�ݠ�V��|?���Kjo��27� V4GK�j���z.g�N1�G���]e)O7Z)�AWK���Cf�Y��=j45��g֮����F��e���]|�[�zC -��U��z����E� �ȴ��"��Mԕz����}���C'-������ձy��z��SFâ2�P�ьzvTI���4I�9�^�*g*����﹑�%�:�~��e���kK�ۮnXJ��C����u�u�:�B|��39l��^�ܲ�sB���[7������վ�ŕ��_�>��6J�"v�F�\�^h��"̀��Y4C�s)�|�����4�?���Hލt�dϓ���E�U6i�d�K�����P0,O@4���+��I��K_'����m�!�0� O�uV�c/�j.B�Ea����:) �)����h;4��'���YL���,�ymQͬ�[ev4���K1�]2��">�y+��-�D�j'ލ�� ���p���-��!��f��'�$i�iD��!ⶲ^W��bQ�mR��� 2. the structure of Earth and the materials from which it is made. The Earth is made up of 3 main sections: the core, mantle and crust. 8�.���[���,�L6��t����¢X8�+;^&=�B'�M7�`�C�4���`vQ����(UD �mv⌈��T)5�7��]�',�����Ty?[�1�/�2QFO)�j��AQ*���vĤ�>���3����cP6�]!���8Qe��s��ז>���. Boston House, The core is earth's source of internal heat because it contains radioactive materials which release heat as they break down into more stable substances. The core is divided into two different zones. The Earth is made up of 3 main sections: the core, mantle and crust. It makes up the bulk of the planet and lies between the core and the crust. Earth’s Interior Structure Page 4 of 22 1. g� %a*�l��V��'�V �PB� �ۮ��ґn�z�E��4y^WM�j�7�i�0=�F�� �Z�������AoۿY�_��uz���w�{���%e\���6�SB�&�/Ӈ��O�D��9�2�� ���i���&��3�����Z�w�� The inner core is solid and is composed of iron and nickel. Their atomic elements include oxygen, silicon and magnesium. It is approximately 2,259 km thick. The inner core is solid and is composed of iron and nickel. This is the thinnest layer and forms the outer shell on which life exists. It is approximately 1,221 km thick and has a density of 12.8g/cm3 at the top of the section and 13.1g/cm3 at its deepest point. ���pk�-�xJ. All of this mantle rock is comprised of a variety of oxides. @�tgZh��F�4B-{y Earth processes, the energy that drives the processes, and the fundamentals of energy transfer in the Earth. 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