Even if you live in the middle of north america, the quality of your watershed can affect the quality of the ocean. how can this be?
select one:
a. evaporation carries materials from your watershed to the ocean.
b. materials in your watershed are eventually transported to an ocean.
c. the amount of water in your watershed will affect ocean evaporation.
d. materials in your watershed are not transported to an ocean

b. Materials in your watershed are eventually transported to an ocean

Explanation:

.A watershed is  called to be as that area  in which surface runoff enters into a river or river system.  Rivers flow from high elevation to low elevation and the lower elevation point in most case is sea. During this flow of river, it also transport the deposit materials in the sea.  

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.