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Figure 3.21 The breakup of Pangaea shown in five stages beginning about 210 million years ago. Inferred motion of lithospheric plates is indicated by arrows. Spreading centers (mid-ocean ridges) are show in red. Panthalese Panthalana 200 MILLION YEARS AGO A single supertontinent-hich geologista now cal Pangana, all land"- washed bya wniversal ocean. Panthalassa AMERICA ASIA 135 MILLION YEARS AGO The northern landmas. Lauresia, has spit from the southern, knownas Gendwana or Gandwanaland. This has aho divided, with India heading nerth toward Eurasia Trench EUROPE NORT AFRICA INDIA 65 MILLION YEARS AGO The Narth Atlantic and Indian Oceans hare taken shape Ifar righti, and the South Atlantic widens. Australa is stil attached to Antarctica. AUSTRALIA EURASIAN PACIFIC ANTARCTICA PLA INDO-AUSTRALI SOMALI PLATE NAZCA PLATE 44 PLATE PLATE PLATE ANTARCTIC a TODAY, Australia has torn from Antarctica. Laurasia has finally separated into North America and Eurasia. India has tareened inta Eutasia, thrusting up the Himalaya. SOMILLION YEARS FROM NOW Australia plows north. The Atlantic and Indian Oceans centinue to wideru the Mediterranean shrins Calfornia west of the San Andrear Fault, detached from the mainland. UTH ERCA lides teward the Aleutian Trench dew aud euboag euogenyuegaz oa PLATE AFRICAN PL ACIFIC Direction of magnetic field Figure 3.27 Particles of iron-bearing magnetite occur naturally in basaltic magma. As this rock forms new sea- bed, the magnetic particles cool, "locking" their mag- netic orientation to that of Earths prevailing magnetic field. If Earths magnetic field changes direction later, the "locked" particles will not respond, but magnetic Particles in magma -These can move particles in any new (hot) magma above will orient to the new field direction. -These cannot move Particles in rigid rock Magnetic particles Cengage Learning

Figure 3.21 The breakup of Pangaea shown in five stages beginning about 210 million years ago. Inferred motion of lithospheric plates is indicated by arrows. Spreading centers (mid-ocean ridges) are show in red. Panthalese Panthalana 200 MILLION YEARS AGO A single supertontinent-hich geologista now cal Pangana, all land"- washed bya wniversal ocean. Panthalassa AMERICA ASIA 135 MILLION YEARS AGO The northern landmas. Lauresia, has spit from the southern, knownas Gendwana or Gandwanaland. This has aho divided, with India heading nerth toward Eurasia Trench EUROPE NORT AFRICA INDIA 65 MILLION YEARS AGO The Narth Atlantic and Indian Oceans hare taken shape Ifar righti, and the South Atlantic widens. Australa is stil attached to Antarctica. AUSTRALIA EURASIAN PACIFIC ANTARCTICA PLA INDO-AUSTRALI SOMALI PLATE NAZCA PLATE 44 PLATE PLATE PLATE ANTARCTIC a TODAY, Australia has torn from Antarctica. Laurasia has finally separated into North America and Eurasia. India has tareened inta Eutasia, thrusting up the Himalaya. SOMILLION YEARS FROM NOW Australia plows north. The Atlantic and Indian Oceans centinue to wideru the Mediterranean shrins Calfornia west of the San Andrear Fault, detached from the mainland. UTH ERCA lides teward the Aleutian Trench dew aud euboag euogenyuegaz oa PLATE AFRICAN PL ACIFIC Direction of magnetic field Figure 3.27 Particles of iron-bearing magnetite occur naturally in basaltic magma. As this rock forms new sea- bed, the magnetic particles cool, "locking" their mag- netic orientation to that of Earths prevailing magnetic field. If Earths magnetic field changes direction later, the "locked" particles will not respond, but magnetic Particles in magma -These can move particles in any new (hot) magma above will orient to the new field direction. -These cannot move Particles in rigid rock Magnetic particles Cengage Learning

Applications and Investigations in Earth Science (9th Edition)
Applications and Investigations in Earth Science (9th Edition)
9th Edition
ISBN:9780134746241
Author:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Publisher:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Chapter1: The Study Of Minerals
Section: Chapter Questions
Problem 1LR
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If a continent twists as it moves over time (as shown for example), would magnetic particles locked in rocks still point north (or south)?

Figure 3.21 The breakup of Pangaea shown in five stages beginning about 210 million years ago. Inferred motion of lithospheric plates is indicated by arrows. Spreading centers (mid-ocean ridges) are show in red. Panthalese Panthalana 200 MILLION YEARS AGO A single supertontinent-hich geologista now cal Pangana, all land"- washed bya wniversal ocean. Panthalassa AMERICA ASIA 135 MILLION YEARS AGO The northern landmas. Lauresia, has spit from the southern, knownas Gendwana or Gandwanaland. This has aho divided, with India heading nerth toward Eurasia Trench EUROPE NORT AFRICA INDIA 65 MILLION YEARS AGO The Narth Atlantic and Indian Oceans hare taken shape Ifar righti, and the South Atlantic widens. Australa is stil attached to Antarctica. AUSTRALIA EURASIAN PACIFIC ANTARCTICA PLA INDO-AUSTRALI SOMALI PLATE NAZCA PLATE 44 PLATE PLATE PLATE ANTARCTIC a TODAY, Australia has torn from Antarctica. Laurasia has finally separated into North America and Eurasia. India has tareened inta Eutasia, thrusting up the Himalaya. SOMILLION YEARS FROM NOW Australia plows north. The Atlantic and Indian Oceans centinue to wideru the Mediterranean shrins Calfornia west of the San Andrear Fault, detached from the mainland. UTH ERCA lides teward the Aleutian Trench dew aud euboag euogenyuegaz oa PLATE AFRICAN PL ACIFIC
Transcribed Image Text:Figure 3.21 The breakup of Pangaea shown in five stages beginning about 210 million years ago. Inferred motion of lithospheric plates is indicated by arrows. Spreading centers (mid-ocean ridges) are show in red. Panthalese Panthalana 200 MILLION YEARS AGO A single supertontinent-hich geologista now cal Pangana, all land"- washed bya wniversal ocean. Panthalassa AMERICA ASIA 135 MILLION YEARS AGO The northern landmas. Lauresia, has spit from the southern, knownas Gendwana or Gandwanaland. This has aho divided, with India heading nerth toward Eurasia Trench EUROPE NORT AFRICA INDIA 65 MILLION YEARS AGO The Narth Atlantic and Indian Oceans hare taken shape Ifar righti, and the South Atlantic widens. Australa is stil attached to Antarctica. AUSTRALIA EURASIAN PACIFIC ANTARCTICA PLA INDO-AUSTRALI SOMALI PLATE NAZCA PLATE 44 PLATE PLATE PLATE ANTARCTIC a TODAY, Australia has torn from Antarctica. Laurasia has finally separated into North America and Eurasia. India has tareened inta Eutasia, thrusting up the Himalaya. SOMILLION YEARS FROM NOW Australia plows north. The Atlantic and Indian Oceans centinue to wideru the Mediterranean shrins Calfornia west of the San Andrear Fault, detached from the mainland. UTH ERCA lides teward the Aleutian Trench dew aud euboag euogenyuegaz oa PLATE AFRICAN PL ACIFIC
Direction of magnetic field Figure 3.27 Particles of iron-bearing magnetite occur naturally in basaltic magma. As this rock forms new sea- bed, the magnetic particles cool, "locking" their mag- netic orientation to that of Earths prevailing magnetic field. If Earths magnetic field changes direction later, the "locked" particles will not respond, but magnetic Particles in magma -These can move particles in any new (hot) magma above will orient to the new field direction. -These cannot move Particles in rigid rock Magnetic particles Cengage Learning
Transcribed Image Text:Direction of magnetic field Figure 3.27 Particles of iron-bearing magnetite occur naturally in basaltic magma. As this rock forms new sea- bed, the magnetic particles cool, "locking" their mag- netic orientation to that of Earths prevailing magnetic field. If Earths magnetic field changes direction later, the "locked" particles will not respond, but magnetic Particles in magma -These can move particles in any new (hot) magma above will orient to the new field direction. -These cannot move Particles in rigid rock Magnetic particles Cengage Learning
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