A watershed is the drainage area of a landscape where water from rain or melting snow and ice drains downhill into a body of water such as a river, lake, reservoir, pond, estuary, wetland, aquifer, sea, or ocean.
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Do u have choices? if one of the choices are 92 thats correct
I believe the answer is the first one you listed,
Hope this helps..
a chemical landfill is where chemical waste is stored once it has been used
if it is secure it means that the waste cannot pollute the environment through water, air etc
