Sol definition, the syllable used for the fifth tone of a diatonic scale. See more.
Examples of index fossils. Index fossils (also known as guide fossils, indicator fossils or zone fossils) are fossils used to define and identify geologic periods (or faunal stages).
What clues do scientists use to study the Earth's history Rocks and Fossils What is the method for determining the age of abjects or events in relation to other objects or events?