Plate tectonics theory took decades to be accepted because:
c)Wegener couldn't explain how continents moved.
Choose the false statement. Pangaea:
c)broke apart due to the force created by Earth's rotation.
Which is not one of the ideas Wegener offered to support his theory?
c)the existence of the mid-ocean ridge, where sea-floor spreading starts
Choose the one type of deposit that is not typical of a tropical/subtropical climate:
Cynognathus, Glossopteris, Mesosaurus, and Lystrosaurus are:
b)land-dwelling species whose distribution suggested joined continents.
Choose the false statement. Glaciers:
b)leave deposits of sediment called bathymetries.
Choose the false statement. Magnetic anomalies are:
c)found only on the sea floor.
The rate of sea-floor spreading:
e)is fast enough to account for the formation and destruction of oceans many times in Earth's history.
Choose the false statement. The age of oceanic crust:
b)is oldest at the mid-ocean ridge and youngest farthest from the ridge.
Choose the false statement. Magnetic reversals:
c)happen slowly as the magnetic poles wander and finally cross the equator.
Which of the following statements is not true about the ocean floor?
c)Oceanic crust contains granite and metamorphic rocks.
The relative widths of magnetic anomalies on the sea floor correspond to the:
a)intervals between magnetic reversals. b)relative durations of polarity epochs.
e)only A and B are true.
Choose the false statement. The paleomagnetic record:
d)is a puzzle; it contradicts the sea-floor spreading concept.
Radiometric dating of a magnetic anomaly stripe of rock that is 225 km away from the mid-ocean ridge axis gives an age of 4.5 million years. Assuming a constant rate, sea-floor spreading in this area is:
c)5 cm per year.
Identify the false statement. Many individuals were involved in developing the theory of plate tectonics, including:
c)Harry Hess, who was the first scientist to notice the fit of the continents.
Identify the false statement.
b)All polarity chrons are the same length of time; they differ only in the magnetic strengths they represent.
Identify the false statement about paired stripes of magnetic anomaly rock across the mid-ocean ridge. (IMAGE)
a)Dividing the age of the rock stripe by its distance from the ridge axis gives the rate of sea-floor spreading.
Identify the false statement about this diagram of the mid-ocean ridge area. (IMAGE)
c)The basalt in stripes A would show reverse polarity.
Which of the following statements is true?
a)Ocean basins get wider as a result of sea floor spreading. b)Ocean floor is destroyed by the process of subduction. c)To keep Earth's surface area constant, the amount of sea floor spreading must equal the amount of subduction. d)Subduction causes continents to move together; sea floor spreading moves them apart. e)All of the above are true.
Identify the false statement. Bathymetric maps show the following features of the sea floor:
e)bands of vertical fractures (fracture zones) that run parallel to mid-ocean ridges.
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