What constitutes a âSolâ cycle in the film âThe Martianâ. While the book uses the term, it does not explain the definition or exact length. Real-life NASA, however, does. One sol = one solar day. Mars Solar Days and 24-hr Clock Convention
Q: Index fossils are used to determine the _____ of the rock. a. age c. color b. makeup d. none of the above A: Index fossils are used to determine the age of the rock. Get an answer
While every fossil tells us something about the age of the rock it's found in, index fossils are the ones that tell us the most. Index fossils (also called key fossils or type fossils) are those that are used to define periods of geologic time. A good index fossil is one with four characteristics: it is distinctive, widespread, abundant and limited in geologic time. Because most fossil-bearing rocks formed in the ocean, the major index fossils are marine organisms. That being said, certain land organisms are useful in young rocks and in specific regions. Any type of organism can be distinctive, but not so many are widespread.