3. The principle that states geologic changes occur
over long periods of time is
a. the threshold theory,
b. catastrophism.
c. gradualism.
d. the feedback mechanism.
Da
bogato breakun into continente during

b. accuracy of the data matters alot more than its number of digits, organization or amount of detail. quantitative observation is more accepted than the qualitative observation.

the answer is d. 74.02

each chemical family is represented as a group or column on the periodic table. based on chemical properties, there are 6 types of chemical families. group 1 represents alkali metals, group 2 represents alkaline earth metals, groups 3 to 12 represent transition metals, groups 13 to 16 represent non-metals and other metals, group 17 represents halogens and group 18 represents noble gases.