51.   Still, the officials said they had not yet determined the exact size or chemical composition of the bomb, which also wounded dozens of other Americans.

52.   That has helped convince Sailor that it may be possible to create portable emission spectrometers for analyzing the chemical composition of samples of contaminants or other compounds.

53.   The chemical composition of mineral water could hold the secret to predicting earthquakes.

54.   The black-and-white pictures, infrared spectrum data on chemical composition and other information will be sent to Earth hours later.

55.   The instrument will allow scientists to create continuous three-dimensional maps of the chemical composition and physical details of the atmosphere throughout the year.

56.   The readings from this first examination of the chemical composition of Mars were radioed to Earth Sunday afternoon for analysis by geologists.

57.   The resulting beams of molecules fall upon an array of detectors, and the impacts are interpreted by a computer in terms of chemical composition.

58.   The pictures were taken with an infrared camera designed to study the light from objects to determine their chemical composition and other characteristics.

59.   The soil must be weeded and irrigated, its chemical composition monitored to keep acidity balanced, and insects and fungi must be warded off.

60.   The teeth preserve a record of the changing chemical composition of the ocean water.