Which sentence uses the word effect correctly

1. how does the storm effect the crops?
2. which was the major effect of the civil war?
3. i know that my decision will effect my grade.
4. the dog attack will effect the leash laws in city park.

Two metal blocks that have slightly different temperatures are placed next to one another. after five minutes, they both have lower but equal temperatures. according to the law of conservation of energy, what  most likelyhappened? energy was created inside the blocks.energy was destroyed inside the blocks.energy was absorbed into the blocks from outside the system.energy was transferred from the warmer block to the cooler block.

Under which circumstances are kp and kc equal for the reaction aa(g)+bb(g)⇌cc(g)+dd(g)?

Which of these is a density dependent factor? a. epidemic b. earthquake c. drought d. hurricane