30 points
>
>
Time management is very much important in IIT JAM. The eduncle test series for IIT JAM Mathematical Statistics helped me a lot in this portion. I am very thankful to the test series I bought from eduncle.
Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
- IIT JAM
- Geology (GG)
Growth lines of coral provide past information about
Choose Your Answer:
2 Attempts
Submit Now
- 0 Likes
- 3 Comments
- 0 Shares
-
![comment-profile-img]()
>
-
![comment-profile-img]()
>
Sajan sarthak Best Answer
coral growth lines Minute growth lines on the outer surfaces of all corals that have a calcified outer wall. The carbonate is secreted by symbiotic algae (zooxanthellae) which, responding to day and night, create a series of diurnal growth increments. Studies on Devonian isolate corals indicate a 400-day year and, therefore, a 22-hour day. Post-Devonian data confirm a near-linear deceleration of the Earth's rotational velocity towards the present 24-hour day. The number of daily growth lines can therefore be used in a crude way to calibrate the geologic record.
![eduncle-logo-app]()
thank u sir for such good explanation
-
![comment-profile-img]()
>
Rahul kumar
![best-answer]()
Growth lines of coral can provide information about the length of the year in the past.
Do You Want Better RANK in Your Exam?
Start Your Preparations with Eduncle’s FREE Study Material
- Updated Syllabus, Paper Pattern & Full Exam Details
- Sample Theory of Most Important Topic
- Model Test Paper with Detailed Solutions
- Last 5 Years Question Papers & Answers
Sign Up to Download FREE Study Material Worth Rs. 500/-
Sajan sarthak
coral growth lines Minute growth lines on the outer surfaces of all corals that have a calcified outer wall. The carbonate is secreted by symbiotic algae (zooxanthellae) which, responding to day and night, create a series of diurnal growth increments. Studies on Devonian isolate corals indicate a 400-day year and, therefore, a 22-hour day. Post-Devonian data confirm a near-linear deceleration of the Earth's rotational velocity towards the present 24-hour day. The number of daily growth lines can therefore be used in a crude way to calibrate the geologic record.
please ask your doubts