Task: Question Answering
Input (English): Background Paragraph: When a solid substance is involved in a chemical reaction, only the matter at the surface of the solid is exposed to other reactants. If a solid has more surface area, more of it is exposed and able to react. Therefore, increasing the surface area of solid reactants increases the reaction rate. Look at the hammer and nails pictured in the Figure below . Both are made of iron and will rust when the iron combines with oxygen in the air. However, the nails have a greater surface area, so they will rust faster. 
Story: Andy is participating in this years science fair. He is testing how fast metal takes to rust. He rakes 3 pieces of iron one is a cube, and the other is a sheet both weighing the same. It takes the cube almost a week to fully rust but the sheet only takes 2 days. The only difference between the two is that the sheet has more surface area. He tries this again with a cylinder so the surface area is larger than the cube but smaller than the sheet and it takes about 4 days to fully rust. 
Question: Will making the surface area of iron larger increase or decrease how fast it rusts?
Output (English): increase.