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Understanding Sea Floor with Mid-Ocean Ridge

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Understanding Sea Floor with Mid-Ocean Ridge

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Questions and Answers

What did the early echo-sounding devices reveal about the ocean floor?

The ocean floor contained an underwater mountain range, later called the Mid-Ocean Ridge (correct)

The ocean floor was a relatively flat surface with few distinct features

The ocean floor was covered in thick layers of sediment

The ocean floor was a deep, featureless abyss

What clues did the discovery of the Mid-Ocean Ridge provide that would soon unlock two mysteries of planet Earth?

Sea floor spreading and plate tectonics

Plate tectonics and continental drift

Sea floor spreading and polar reversal (correct)

Sea floor spreading and continental drift

What was the primary limitation that scientists in the 1800s faced when trying to explore the ocean floor?

Lack of suitable vessels for deep-sea exploration (correct)

Lack of funding for ocean exploration

Lack of advanced mapping technology

Lack of scientific interest in the ocean floor

What was the prevailing scientific opinion about the ocean floor in the 1800s?

The ocean floor was a flat, featureless surface Signup and view all the answers

What type of new technology was used in the middle of the 20th century to detect peculiar magnetic readings from the ocean floor?

Magnetometers Signup and view all the answers

What was the significance of the peculiar magnetic readings detected from the ocean floor?

They revealed the process of sea floor spreading Signup and view all the answers

Which of the following was NOT a key discovery or development that helped scientists understand the ocean floor in the early-to-mid 20th century?

The discovery of continental drift Signup and view all the answers

What is the main component of the ocean floor that gives it magnetic properties?

Iron-rich, volcanic rock called basalt Signup and view all the answers

What did scientists initially discover about the magnetic properties of the ocean floor?

The ocean floor had stripes of rock with different polarities Signup and view all the answers

What hypothesis did scientists develop to explain the alternating pattern of magnetic polarity in the ocean floor?

The earth's magnetic field has flipped-flopped over time Signup and view all the answers

What process leads to the creation of new oceanic crust and the alternating pattern of magnetic polarity?

Seafloor spreading at mid-ocean ridges Signup and view all the answers

How do the magnetic minerals in the solidifying rock record the earth's magnetic orientation at the time?

The minerals align themselves with the earth's magnetic field as the rock cools Signup and view all the answers

What is the significance of the alternating pattern of magnetic polarity in the ocean floor?

It provides evidence for the theory of plate tectonics and seafloor spreading Signup and view all the answers

What is the relationship between the age of the ocean floor and its distance from the mid-ocean ridge?

The older the ocean floor, the farther it is from the mid-ocean ridge Signup and view all the answers

What is the role of magma in the process of seafloor spreading?

Magma cools and solidifies to form new oceanic crust Signup and view all the answers