help please Section Date: Name: Course: sed to air or water Rule 2 of magma cool

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help please

Section Date: Name: Course: sed to air or water Rule 2 of magma cooling: Circle the correct choice Magma loses heat much (faster/slower) when expos than it does when surrounded by other rock, because wall rock is a good insulator (o) Consider two cubes of steel measuring 1 m on a side One is cut in haif in each dimension to make eight smaller cubes 1m (i) What is the surface area of the large cube? (i) Imagine the large and small cubes are heated in a furnace to 500 C and removed. Which will cool fa cm2 Of the eight small cubes? cool faster, the cube or the smaller ones? (ii) Explain why this happens. Rule 3 of magma cooling: Circle the correct choice. A small mass of magma loses heat (faster/slower) than a large one. (d) Now you can put the rules to use. (0 In general, lava flows and shallow intrusive igneous rocks have (finer/coarser) grains than deep intrusive rocks. (i) In general, thick lava flows, sills, and dikes have (finer/coarser) grains than thin ones. (ii) Which of the rocks in Figure 5.2 was probably extrusive? (iv) Which were probably intrusive? (continued)

Explanation / Answer

1) a. Surface area of large cube is 100 cm2. Surface area of smaller cubes are 50 cm2.

b. Smaller cubes are cooling faster than larger cube.

c. Because the surface area of the cube is smaller than larger cube. So, less surface area, thats the amount of face, that touches the outside with smaller core. Surface area and volume increase differently. Surface area is, for cubes, is 6x12m, whereas volume is 13m. As such, volume increases faster than surface area when dimensions change. As such, smaller things have a larger surface area in regards to their volumes than larger things. Thus, they would cool, or heat, faster than larger things.

Rule 3. Small mass of magma losses heat more than larger one

Rule 3: d)

i) In general lava flows or shallow intrusive igneous rocks have finner grains than deep intrusive rocks.

ii) In general, thick lava flows, sills and dikes have coarser grains than thin ones.

iii) Where the figure 5.2??? If this fig is cube then the answer is smaller cubes.

iv) Where the figure 5.2?? If the fi is cube then the answer is larger one is intrusive

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