How can brincle(natural phenomena) happen

  The Brinicle is a natural phenomenon that can be found in the depths of the Antarctic oceans. It is a frozen, deadly stalactite formed by a mass of very cold salt water which comes into contact with warmer water under the surface of ice further down towards the seafloor where temperature decreases rather quickly.

the answers for the whole quick check is

1. b

2. b

3. a

4. c

5. b

6. a

7. d

the answer is b. apsidal precession