What happens when close off the end of a garden hose?

Ineed with these last two questions: 1) what are two types of cold air masses that influence the weather in north america? name them and describe their humidity. 2) describe the motion of a cold air mass and a warm air mass and the weather you would expect at a warm front and an occluded front.

If the chemical properties of a substance remain unchanged and appearance or shape of a substance changes it is called a ?

What happens when you slowly pulled the carboard?