Twenty-two feet long and 10 feet in diameter, the AM-1 is one of the many newsatellites that is a part of 15 years effort of subjecting the interactions of Earth's atmosphere, oceans, and land surfaces to detailed scrutiny from space.
A. satellites that is a part of 15 years effort of subjecting the interactions of Earth's atmosphere, oceans, and land surfaces- "is" does not work with plural subject "satellites"
B. satellites, which is a part of a 15-year effort to subject
...
A. satellites that is a part of 15 years effort of subjecting the interactions of Earth's atmosphere, oceans, and land surfaces- "is" does not work with plural subject "satellites"
B. satellites, which is a part of a 15-year effort to subject
...
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