21.   Bakelite and Catalin are of nearly identical chemical composition, both being made of varying amounts of phenol and formaldehyde mixed with a catalyst.

22.   Based on those tests, it is possible to determine the chemical composition of a high-temperature accelerant, Carman said.

23.   -- Some type of reaction related to the chemical composition of jet A fuel or jet A fuel vapors.

24.   After touchdown, the rover is to and begin at least a week of remotely controlled excursions to take close-up pictures of rocks and analyze their chemical composition.

25.   But the chemical composition of the comets is different from that of the planets.

26.   But they only treat the problem instead of preventing it, said Brittle, who is concerned about the chemical composition of tiny particles.

27.   By analyzing dark lines in stellar spectra, astronomers measure the motions and chemical compositions of stars.

28.   Data about the chemical composition of a whitish rock called Scooby Doo have been received, Golombek said, but have not been analyzed.

29.   During the flight, radiation changed the chemical composition of the film.

30.   For years, scientists have found numerous meteorites whose chemical composition differed from almost all other space rocks found on Earth.