Index Fossils Are Blank Weegy. 3.4 classification of igneous rocks as has already been described, igneous rocks are classified into four categories, based on either their chemistry or their mineral composition: Fossils also form from molds and casts.
Index fossils are those that are used to define periods of geologic time. Sedimentary rocks can tell us a great deal about the environmental conditions that existed during the time of their formation. Make some inferences about the source rock, weathering, sediment transportation, and deposition conditions that existed during the formation of the following rocks.
Wouldn't the average of these three be 13, instead of 12.011?
On rare occasions, fossils are found in metamorphic rocks, but they are deformed by the heat and pressure. All of the following conditions (quick burial by sediments, protection from scavengers, and hard parts) help preserve organisms as fossils except: Thanks for checking my question out! Index fossils are those that are used to define periods of geologic time.