Why is the Mid-Atlantic Ridge important to geologists?

A) It is a divergent boundary, causing the Atlantic Ocean to widen by about 5 centimeters each year.
B) Massive earthquakes take place there every day.
C) It is the source of tsunamis.
D) Plate subduction occurs, shrinking the Atlantic ocean about 5 centimeters each year.


Answer: A

Environmental & Atmospheric Sciences

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Seafloor spreading

A) ended with the breakup of Pangaea. B) is the result of subduction. C) can occur at divergent plate boundaries. D) was documented by Alfred Wegener.

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You are given two igneous rock samples; one is said to be an intrusive (plutonic) rock and the other an extrusive (volcanic) rock. How can you tell which is which?

What will be an ideal response?

Environmental & Atmospheric Sciences

Sometimes tiny pyroclastic particles are ejected into the atmosphere and settle to the surface as a(n) ____________________. In contrast, a(n) ____________________ is a cloud of these tiny particles and gas that moves along or close to the land surface

Fill in the blank(s) with correct word

Environmental & Atmospheric Sciences

Heat transfer from the equatorial regions to the poles ceased during the ____

A)Paleogene B)Paleocene-Eocene Thermal Maximum C)Paleogene Thermal Maximum D)Holocene glaciation E)Pleistocene glaciation

Environmental & Atmospheric Sciences