In terms of action-reaction force pairs, explain why it is important to use helmets, elbow pads, knee pads and other protective clothing while using skateboards or in-line skates

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