1. Since 1970, annual worker fatalities on the job have decreased in America by about
75 percent
63 percent
half
one-third

The freezing and boiling point of a substance changes as the air pressure around it changes. for example, at a lower air pressure (higher altitude) it is easier for water molecules to escape from liquid into the air. in a high altitude city such as denver, colorado compared to a sea-level city such as houston, texas, water