Chapter 6.  Igneous Rocks and Activity

  1. define the term rock.

  2. distinguish between magma and lava.

  3. distinguish between intrusive and extrusive rocks; between volcanic and plutonic rocks.

  4. describe the various geologic structures formed by volcanoes and the underground solidification of magma (plutons).

  5. discuss the variety of ways in which many different rocks might be derived from the same parent magma including fractional crystallization, assimilation of country rock, and magma mixing.

  6. distinguish between and give examples of rocks which possess the following texture types:  phaneritic, aphanitic, glassy, porphyritic (including ground mass and phenocrysts), pegmatitic, and pyroclastic.

  7. be generally familiar with the peridotite, basalt-gabbro, andesite-diorite, and granite-rhyolite families of igneous rocks.

  8. give a general explanation for Bowen's reaction series, including both the continuous and discontinuous aspects.

  9. intelligently use the terms mafic, felsic, silicic, and intermediate rocks.

  10. make a connection between the production of igneous rocks and structures with plate tectonics theory..  Where and how are these structures formed today?

  11. describe the significance of pillow basalts.

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Critical Thinking Questions and Activities:

  1. On a lonely Friday night, watch a lava lamp do its thing!  Now try to figure out why this is an appropriate activity for this chapter.

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Field Trip Opportunities:

  1. Visit a cemetery or take a self-guided walking tour of downtown Scranton to find examples of igneous, sedimentary, or metamorphic rock types used as building or paving materials.