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Astronomers used the cross-staff for measuring the angle between the directions of two stars. ... Ships' officers used it to measure the elevation angle of the noontime Sun above the horizon, which allowed them to estimate their latitude
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by limiting the amount of trees
Answer:
4) to reduce greenhouse gases
<span>a slow increase in the overall temperature of the earth's atmosphere generally attributed by increased levels of carbon dioxide, chlorofluorocarbons, and other pollutants.</span>