Ice melting from water. Nothing has changed except the state of matter.
Arteries carry blood away from the heart and veins carry blood back to the heart. Hope that helps (:
Answer:
radiation, conduction, convection, conduction
Acid rain<span> is caused by a chemical reaction that begins when compounds like sulfur dioxide and nitrogen oxides are released into the air. These substances can rise very high into the atmosphere, where they mix and react with water, oxygen, and other chemicals to form more acidic pollutants, known as </span>acid rain<span>.</span>
The best answer choice here would be 'Combination'
