Question and answer
The main causes of the disasters that cause mass extinctions seem to come either from above, in the form of deadly asteroids or comets, or from below, in the form of extreme volcanic activity.
TRUE: The main causes of the disasters that cause mass extinctions seem to come either from above, in the form of deadly asteroids or comets, or from below, in the form of extreme volcanic activity.
Expert answered|googoogaga|Points 150|
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Asked 3/6/2011 2:51:33 PM
Updated 6/17/2014 11:26:36 AM
0 Answers/Comments
This answer has been confirmed as correct and helpful.
Edited by Janet17 [6/17/2014 11:26:34 AM], Confirmed by Janet17 [6/17/2014 11:26:36 AM]
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The scientific study of fossils is?
Question
Updated 7/7/2015 3:30:17 PM
1 Answer/Comment
The scientific study of fossils is called Paleontology.
Added 7/7/2015 3:30:15 PM
This answer has been confirmed as correct and helpful.
Stromatolites are?
Question
Not Answered
Updated 6/17/2014 12:54:57 PM
5 Answers/Comments
Stromatolites are layered structures formed in shallow water by the trapping, binding and cementation of sedimentary grains by biofilms of microorganisms, especially cyanobacteria (commonly known as blue-green algae). They include some of the most ancient records of life on Earth. See:
Added 3/6/2011 4:53:25 PM
Stromatolites are layered structures formed in shallow water by the trapping, binding and cementation of sedimentary grains by biofilms of microorganisms, especially cyanobacteria (commonly known as blue-green algae). They include some of the most ancient records of life on Earth.
Added 6/17/2014 11:25:27 AM
This answer has been confirmed as correct and helpful.
Janet, please try to answer in your own words. The only exception to the c&p rule is for direct definitions but they should be limited to one sentence.
Added 6/17/2014 11:56:12 AM
I checked the wording very carefully, and weighed up my decision, before I reproduced the original entry. It is not an exact copy of the wikipedia entry (we are allowed to paraphrase) and I considered that the original expert had expressed the answer as well if not better than I could have myself.
Added 6/17/2014 12:54:57 PM
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