Having trouble with these questions. 2. Lava flows and volcanic ash deposits are

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Having trouble with these questions.

2. Lava flows and volcanic ash deposits are examples of a. intrusive igneous rocks. b. extrusive igneous rocks. c. both intrusive and extrusive igneous rocks d. none of the above 3. The difference between sills and dikes is that a. sills are intrusive, dikes extrusive. b. sills are extrusive, dikes intrusive. c. sills are tabular bodies, dikes irregularly shaped blobs. d. sills are parallel to layering in surrounding rocks while dikes cut across the layering. 4. Grain size in an igneous rock is determined by the a. temperature at which its magma melted. b. temperature at which the magma solidified c. tectonic setting in which the magma developed. d. amount of ionic migration while the magma was liquid. 5. Formation of large grains in an igneous rock is aided by a. magma with a low viscosity b. very slow cooling c. the presence of water in the magma d. All of the above.

Explanation / Answer

1. Lava flows and volcanic arc deposits are examples of extrusive igneous rocks.

2. The difference between sills and dikes is that sills are parallel to layering in surfosurrou rocks while dikes cut across the layering.

3. Grain size in an igneous rocks is determined by the temperature at which the magma solidified.

5. Formation of large grains in an igneous rock is aided by very slow cooling.

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