I have meet some problem about my geology when I doing my homework . 1. Evidence

Question

I have meet some problem about my geology when I doing my homework.

1.Evidence for volcanic activity on the seaflor associated with Iceland extends both to the east and to the west of Iceland. This is called the "trail" of the mantle plume. How does the bathymetry (shape of the seafloor) east and west of Iceland vary from the seafloor to the north and south of these areas?

A.There are deep ocean trenches, indicating the presence of subduction zones.
B.There are abundant mid-ocean ridges.
C.The area is smoother and flatter from the abundant lava flows.
D.There is no noticable difference.

2. The North Atlantic opened up as the supercontinent of Pangaea broke apart. Evidence of this event in the form of volcanic rocks stretches from Greenland to Europe. How long ago did Greenland separate from Europe, based on the ages of volcanic rocks associated with the Iceland mantle plume "trail", from Greenland to the British Isles?
A.5 million years ago
B.30-40 million years ago
C.40-50 million years ago
D.50-60 million years ago

3.what direction does the continent of Africa appear to be moving?
A.north
B.south
C.east
D.west

Explanation / Answer

1. B. There are abundant mid-ocean ridges.

2. C. 40-50 million years ago

3. C. east

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