Which of the following is an example of chemical weathering? 1. frost wedging 2. animal activity 3.oxidation 4. abrasion

The answer is #3: Oxidation because oxidation is when a substance reacts with oxygen, which causes the substance to rust.  When a rock contains iron and that iron comes in contact with oxygen, iron oxide is created; this weakens the rock.  

Question was not very clear if there are specific answer choices tell me and i'll try to you more. hope this though2 laps is 1 min. we know that for each min she does two times the amount of laps. for 12 laps we can do 12/2 which does give us 12 laps in 6 mins not 16 mins.