How did geologists decide where one division of the geologic time scale ends and the next begins

Dose local topography and sea surface temp contribute to differences in climate between baeious localities

Which describes italy’s mediterranean climate? a. moist in the summer and dry in the winter b. mild and wet all year round c. cool in the summer and warm in the winter d. hot in the summer and mild in the winter

Why slip off slopes are found on the inside of meanders? why river cliffs are found on the outside of meanders?