Cracking you knuckles isn't bad as long as you push on them
lightly.
View page
Cracking long-chained hydrocarbons produces two things which
include alkenes and alkanes(shorter chains), including hydrogen
through catalytic cracking.
View page
Pot, fish doesn't go with kettle.
View page
Cracking is correct, as in cracking an egg.
View page
Endothermic because the egg is absorbing the heat.