We can serve you with a broad range of coverage against all kinks of risks for sea transport.
Generally speaking, aviation insurance is much cheaper than marine insurance.
Then "all marine risks" means less than "all risks".
In the insurance business, the term "average" simply means "loss" in most cases.
Are there any other clauses in marine policies?
Breakage is a particular average, isn't it?
the risk of breakage is covered by marine insurance, isn't it?
The English understood by "marine risks" only risks incident to transport by sea.
Generally, the term "all marine risks" is liable to be misinterpreted and its use should be avoided in L/C.