Many United States weather maps throughout the year will look similar to the one above. Which explanation best describes the cause of this phenomenon ? Evaporation of ocean water creates fronts that approach the United States from both coasts . The west coast of the United States is normally colder than the east coast . Ocean waves cause movement in the air masses in the same direction . The unique shape of the United States land mass cause these weather patterns to occur regularly

hydrogen is a compound or a single element and a element is a pure substence that cannot be separated into simpler subtances

clorine is a compound its a chemical substance that forms when two or more different elements combine

so both hydrogen and clorine are compounds

well first you need the sample of the temperature and gas level. i couldnt write a hypothesis unless i had some data. i think temperature changes will effect volumes of gas because gas changed into a solid or liquid at specific temperatures.