What types of geologic evidence support the Snowball Earth model for the Late Precambrian glaciations?
What will be an ideal response?
Paleomagnetic evidence indicates that glaciers existed at or near the equator during this time. Additionally, banded iron formations indicate an anoxic deep ocean, which could have resulted from a separation of the ocean from the atmosphere resulting from the ice, and the placement of cap carbonates above glacial layers agrees with the CO2 build-up that could have been the means of escape from this Snowball Earth episode.
You might also like to view...
All of the following statements about forecast quality are true, except
A) it is not affected by forecast skill. B) it is related to forecast accuracy. C) it takes into account forecast bias. D) it takes into account the agreement between prediction and reality.
How old is the solar system, and how is this age determined?
What will be an ideal response?
Which type of damage does NOT typically accompany a hurricane’s storm surge?
a. ?Buildings, bridges, and piers are washed away. b. ?Dunes are washed away. c. ?Houses not on high posts are floated and carried farther onshore. d. ?Heavy sand is deposited on beaches, partly burying some homes. e. ?Saltwater invades and contaminates groundwater.
Magnetic declination is:
a. the angular difference between magnetic north and the Arctic Circle b. the angular difference between magnetic north and true geographic north c. the angular difference between magnetic north and the prime meridian d. the angular difference between magnetic north and the equator