Can someone with putting commas

determine whether the underlined phrase or clause in each sentence is restrictive or nonrestrictive.
1. lightning that strikes in dry forests can cause forest fires.
restrictive; no commas needed
nonrestrictive; commas are needed
2. often thunderstorms produce lightning that ignites wet areas.
restrictive; no commas needed
nonrestrictive; commas are needed
3. lightning which occurs all over the world is an amazing phenomenon.
restrictive; no commas needed
nonrestrictive; commas are needed
4. thunder which can be quite loud follows a lightning crash.
restricitve; no commas needed
nonrestricitve; commas are needed
5. a bolt of lightning striking a person usually causes very serious injury or death.
restrictive; no commas needed
nonrestrictive; commas are needed