useless trivia: What Word Means: To Split Under Pressure, Such As Bricks?

Questions

07 February 1960 Old handwriting found in at---------- , near the Dead Sea ?

12 February 1960 Chinese army kills 12 ---------- soldiers ?

13 February 1960 ---------- performs 1st nuclear test at Reggane Proving Grounds Algeria ?

14 February 1960 Marshal Ayub Khan elected President of ---------- ?

16 February 1960 US ---------- submarine USS Triton set off on underwater round-world trip ?