Final answer:
The small block of iron will have a greater density than the large block of ice, since iron has a higher density (approximately 7.87 g/cm³) compared to ice (approximately 0.92 g/cm³), regardless of the size of the blocks.
Step-by-step explanation:
The question asks which has a greater density: a large block of ice or a small block of iron. The size of the block (large or small) does not affect the density of the material. Density is an intrinsic property of a substance, defining its mass per unit volume, and it is independent of the amount of material present. Therefore, the correct answer is (b) Small block of iron, because iron has a higher density than ice regardless of the size of the block. To explain further, irrespective of whether a block of a substance is big or small, if it is made of the same material, it will have the same density. For example, if we refer to a density chart, we can see that iron typically has a density of about 7.87 g/cm³, while ice has a density of approximately 0.92 g/cm³. Hence, a block of iron, even if it is smaller, will be denser than a block of ice.