Before you go any further...
I've read and accept the Terms of Use and the Privacy Policy.
I accept to receive newsletter and other communications associated with firms of The Explorers Network group'
I accept to receive commercial offers of The Explorers Network partners'.
Read Terms of Use
Read Privacy Policy

Thanks!

Vote everyday for your favorite content

SENSITIVE CONTENT

This media contains sensitive content which some people may find disturbing or offensive.

You must be 15 years of age or older to view sensitive content.

Log in
Birthday

SENSITIVE CONTENT

This media contains sensitive content which some people may find disturbing or offensive.

You chose not to view sensitive content, do you wish to change this choice?

Content being validated
THE EXPLORERS +
Watch our premium movies
The Explorers + is our premium movie catalog in Ultra High Definition (HD/4K/8K)! Hundreds of videos already available and daily new content on all your devices (web, mobile, tablets, smart TV).
cloud
Post content (photo or video) and get 1-month free
OR
Subscribe and support The Explorers Foundation's field actions for biodiversity.
POST
Discover The Explorers +
Any questions? Read our FAQs
Any questions? Read our FAQs
Content being validated
Needle concretions
1
0
The Explorers
The Explorers
When - during its transit in the fissures network of the calcareous rock of Makatea - the carbonate-laden water arrives on the ceiling of a cave, it encounters new physicochemical conditions which lead to the precipitation of carbonate and give birth to various concretions. The formation of finer needles is related to the precipitation of aragonite which depends on the temperature and hygrometry conditions.
Read More
Translate
Related content

Médias en cours d’exploration

We use different technologies, such as Cookies, so our website can operate properly, but also to provide features related to social networks and to analyze our traffic. You can change your mind at any time.
bandeauCookie_learnmore