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sea floor spreading

sea floor spreading
27問 • 2年前
  • Gwenneth Dalawampu
    • 通報

    問題一覧

  • 1

    Which of the following supports the theory of seafloor spreading?

    magnetic reversal

  • 2

    Why were magnetic patterns found on the ocean floor puzzling?

    They showed alternating bands of normal and reversed polarity.

  • 3

    How did scientists discover that rocks farther away from the mid-ocean ridge were older than those near it?

    by determining the age of rock samples obtained by drilling on the sea floor

  • 4

    What does scientist thought about the seafloor before they had data from echo sounders?

    The seafloor is completely flat.

  • 5

    What features of seafloor mountain ranges on the ocean floor upwells magma and formed new ocean floor?

    mid-ocean ridge

  • 6

    What technology did scientist used in the mid-1900s to map the mid-ocean ridge?

    magnetometer

  • 7

    Which of the following is not included in the group?

    molten materials

  • 8

    What feature of seafloor is described as the deepest areas of the ocean where subduction takes place?

    trench

  • 9

    What indicators were observed by geologist to conclude that the polarity is reversed?

    the north and south are at the center

  • 10

    Which scientist from the 1960s is credited for proposing the theory of seafloor spreading?

    Harry Hess

  • 11

    What earth internal process drives seafloor spreading?

    convection

  • 12

    Where can we usually found the shrimps, crabs and other organisms cluster near hot water vents in the ocean floor?

    deep-ocean floor

  • 13

    Which is not true about the age pattern on the seafloor?

    The youngest seafloor can be found towards the edges of the ocean, near the eastern and western continents

  • 14

    What comprises the Mid-Ocean ridges?

    mountains

  • 15

    Where do you expect to find the oldest rock on the ocean floor?

    further away from the ridge

  • 16

    rocks shaped like pillows (rock pillows) show that molten materials have erupted again and again from cracks along the midocean ridge and cooled quickly.

    Evidence from molten materials

  • 17

    rocks that make up the ocean floor lie in a pattern of magnetized stripes which hold a record of the reversals in magnetic field

    Evidence from magnetic strip

  • 18

    core samples from the ocean floor show that older rocks are found farther from the ridge; youngest rocks are in the mid-ocean ridge

    Evidence from drilling sample

  • 19

    How did drilling samples show that seafloor spreading has really taken place?

    The further away from the ridge the samples were taken, the older the rocks were, the younger rocks were always in the center of the ridges.

  • 20

    In seafloor spreading, in which of the following parts does molten material rises from the mantle and erupts or flows out?

    Along mid-ocean ridges

  • 21

    Mr. Alvarez wants to make a research about the magnetic property of the sea floor. One day he joined his friend in making a research. He noticed that he used a device that detect magnetic field. What do you call that instrument?

    magnetometer

  • 22

    Which is not involved in the process of seafloor spreading?

    it tends to happen near the edges of continents

  • 23

    How will you compare the age of the rocks in the seafloor?

    the younger rocks are in the middle at the ridge, the older are far from the ridge

  • 24

    What are the evidences that support the theory of seafloor spreading?

    Molten materials, magnetic strips, drilling sample

  • 25

    What feature of seafloor is shallow, gradually sloping seabed around the edge of a continent and has a depth less than 200 meters and can be thought of as the submerged edge of a continent?

    Mid- ocean ridge

  • 26

    How was new oceanic crust formed?

    when molten material cool and form strip of solid rocks in the center of the ridge.

  • 27

    What is the age of the oldest seafloor?

    1.8 million years

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    問題一覧

  • 1

    Which of the following supports the theory of seafloor spreading?

    magnetic reversal

  • 2

    Why were magnetic patterns found on the ocean floor puzzling?

    They showed alternating bands of normal and reversed polarity.

  • 3

    How did scientists discover that rocks farther away from the mid-ocean ridge were older than those near it?

    by determining the age of rock samples obtained by drilling on the sea floor

  • 4

    What does scientist thought about the seafloor before they had data from echo sounders?

    The seafloor is completely flat.

  • 5

    What features of seafloor mountain ranges on the ocean floor upwells magma and formed new ocean floor?

    mid-ocean ridge

  • 6

    What technology did scientist used in the mid-1900s to map the mid-ocean ridge?

    magnetometer

  • 7

    Which of the following is not included in the group?

    molten materials

  • 8

    What feature of seafloor is described as the deepest areas of the ocean where subduction takes place?

    trench

  • 9

    What indicators were observed by geologist to conclude that the polarity is reversed?

    the north and south are at the center

  • 10

    Which scientist from the 1960s is credited for proposing the theory of seafloor spreading?

    Harry Hess

  • 11

    What earth internal process drives seafloor spreading?

    convection

  • 12

    Where can we usually found the shrimps, crabs and other organisms cluster near hot water vents in the ocean floor?

    deep-ocean floor

  • 13

    Which is not true about the age pattern on the seafloor?

    The youngest seafloor can be found towards the edges of the ocean, near the eastern and western continents

  • 14

    What comprises the Mid-Ocean ridges?

    mountains

  • 15

    Where do you expect to find the oldest rock on the ocean floor?

    further away from the ridge

  • 16

    rocks shaped like pillows (rock pillows) show that molten materials have erupted again and again from cracks along the midocean ridge and cooled quickly.

    Evidence from molten materials

  • 17

    rocks that make up the ocean floor lie in a pattern of magnetized stripes which hold a record of the reversals in magnetic field

    Evidence from magnetic strip

  • 18

    core samples from the ocean floor show that older rocks are found farther from the ridge; youngest rocks are in the mid-ocean ridge

    Evidence from drilling sample

  • 19

    How did drilling samples show that seafloor spreading has really taken place?

    The further away from the ridge the samples were taken, the older the rocks were, the younger rocks were always in the center of the ridges.

  • 20

    In seafloor spreading, in which of the following parts does molten material rises from the mantle and erupts or flows out?

    Along mid-ocean ridges

  • 21

    Mr. Alvarez wants to make a research about the magnetic property of the sea floor. One day he joined his friend in making a research. He noticed that he used a device that detect magnetic field. What do you call that instrument?

    magnetometer

  • 22

    Which is not involved in the process of seafloor spreading?

    it tends to happen near the edges of continents

  • 23

    How will you compare the age of the rocks in the seafloor?

    the younger rocks are in the middle at the ridge, the older are far from the ridge

  • 24

    What are the evidences that support the theory of seafloor spreading?

    Molten materials, magnetic strips, drilling sample

  • 25

    What feature of seafloor is shallow, gradually sloping seabed around the edge of a continent and has a depth less than 200 meters and can be thought of as the submerged edge of a continent?

    Mid- ocean ridge

  • 26

    How was new oceanic crust formed?

    when molten material cool and form strip of solid rocks in the center of the ridge.

  • 27

    What is the age of the oldest seafloor?

    1.8 million years