Goes up and forms , then down as , then into the , and flows underground until it gets to a . After that, it flows into the and eventually goes back into the

the correct option is c.

isotopes refers to different forms of the same element with the same atomic number but different mass number as a result of difference in their neutron numbers. isotopes have different relative atomic mass but share the same chemical properties.

a

catya your not at all which answer i've seen you do this on another question!