Which term is defined by the amount of a certain isotope that occurs in a natural sample of an element?
a) percent abundance
b) percent atomic weight
c) average atomic mass
d) ion abundance

The gulf stream is a warm water current that flows away from the equator to northern europe. witch of these does it cause. a. crashes of warm and cool water in the ocean b.colder climates near the equator c.large waves on the cost of europe d.warm climates in northern europe